diff --git a/Changes.txt b/Changes.txt
index fdac5948c..779db32b2 100644
--- a/Changes.txt
+++ b/Changes.txt
@@ -22,6 +22,8 @@
 
   * Enhanced Game Properties dialog for multigame ROMs.
 
+  * Added 2nd UI theme and hotkey for toggling UI theme.
+
   * Added optional type format detection based on colors used.
 
   * Added Joy2B+ controller support.
@@ -34,6 +36,8 @@
 
   * Fixed broken 7800 pause key support.
 
+  * Fixed broken mouse and Stelladaptor input for Driving Controller.
+
   * Added user defined CPU cycle timers to debugger.
 
   * For UNIX systems: Now defaults to using system-installed libsqlite3
diff --git a/docs/graphics/options_misc.png b/docs/graphics/options_misc.png
index f4ebf7ca4..f8d676b2b 100644
Binary files a/docs/graphics/options_misc.png and b/docs/graphics/options_misc.png differ
diff --git a/docs/index.html b/docs/index.html
index c56982542..566b056cc 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -2034,6 +2034,11 @@ <h2><b><a name="Hotkeys">Hotkeys</a></b></h2>
       <td>Alt + Return</td>
       <td>Cmd + Return</td>
     </tr>
+    <tr>
+      <td>Toggle UI theme</td>
+      <td>Alt + T</td>
+      <td>Cmd + T</td>
+    </tr>
     <tr>
       <td>Exit Stella</td>
       <td>Control + Q</td>
@@ -3149,7 +3154,17 @@ <h2><b><a name="CommandLine">Using the Command Line</a></b></h2>
 
     <tr>
       <td><pre>-uipalette &lt;standard|classic|light|dark&gt;</pre></td>
-      <td>Use the specified palette for UI elements.</td>
+      <td>Define default palette/theme for UI elements.</td>
+    </tr>
+
+    <tr>
+      <td><pre>-uipalette2 &lt;standard|classic|light|dark&gt;</pre></td>
+      <td>Define alternative palette/theme for UI elements.</td>
+    </tr>
+
+    <tr>
+      <td><pre>-altpalette &lt;1|0&gt;</pre></td>
+      <td>Use alternative palette/theme for UI elements.</td>
     </tr>
 
     <tr>
@@ -3850,7 +3865,8 @@ <h2><b><a name="Options">Changing Options</a></b></h2>
       <td valign="top">
         <table border="1" cellpadding="4">
           <tr><th>Item</th><th>Brief description</th><th>For more information,<br>see <a href="#CommandLine">Command Line</a></th></tr>
-          <tr><td>Theme</td><td>Theme to use for UI elements (see examples)</td><td>-uipalette</td></tr>
+          <tr><td>Theme #1</td><td>Default theme to use for UI elements (see examples)</td><td>-uipalette</td></tr>
+          <tr><td>Theme #2</td><td>Alternative theme to use for UI elements (see examples)</td><td>-uipalette2</td></tr>
           <tr><td>Dialogs font</td><td>The font used in the dialogs</td><td>-dialogfont</td></tr>
           <tr><td>HiDPI mode</td><td>Scale the UI by a factor of two when enabled</td><td>-hidpi</td></tr>
           <tr><td>Dialogs position</td><td>Position of dialogs with Stella window</td><td>-dialogpos</td></tr>
diff --git a/src/common/PKeyboardHandler.cxx b/src/common/PKeyboardHandler.cxx
index 2936ba99a..e66ca015d 100644
--- a/src/common/PKeyboardHandler.cxx
+++ b/src/common/PKeyboardHandler.cxx
@@ -836,6 +836,7 @@ PhysicalKeyboardHandler::DefaultMenuMapping = {
   {Event::UITabPrev,                KBDK_TAB, KBDM_SHIFT | KBDM_CTRL},
   {Event::UITabNext,                KBDK_TAB, KBDM_CTRL},
 
+  {Event::ToggleUIPalette,          KBDK_T, MOD3},
   {Event::ToggleFullScreen,         KBDK_RETURN, MOD3},
 
 #ifdef BSPF_MACOS
diff --git a/src/common/jsonDefinitions.hxx b/src/common/jsonDefinitions.hxx
index 642f27ec3..b3e74590f 100644
--- a/src/common/jsonDefinitions.hxx
+++ b/src/common/jsonDefinitions.hxx
@@ -284,6 +284,7 @@ NLOHMANN_JSON_SERIALIZE_ENUM(Event::Type, {
   {Event::UITabPrev, "UITabPrev"},
   {Event::UITabNext, "UITabNext"},
   {Event::UIHelp, "UIHelp"},
+  {Event::ToggleUIPalette,  "ToggleUIPalette" },
   {Event::MouseAxisXMove, "MouseAxisXMove"},
   {Event::MouseAxisYMove, "MouseAxisYMove"},
   {Event::MouseAxisXValue, "MouseAxisXValue"},
diff --git a/src/emucore/Event.hxx b/src/emucore/Event.hxx
index 2211351ab..efa863f4d 100644
--- a/src/emucore/Event.hxx
+++ b/src/emucore/Event.hxx
@@ -148,7 +148,7 @@ class Event
       SelectHome, SelectEnd, SelectAll,
       Delete, DeleteLeftWord, DeleteRightWord, DeleteHome, DeleteEnd, Backspace,
       Cut, Copy, Paste, Undo, Redo,
-      AbortEdit, EndEdit,
+      AbortEdit, EndEdit, ToggleUIPalette,
 
       HighScoresMenuMode,
       // Input settings
diff --git a/src/emucore/EventHandler.cxx b/src/emucore/EventHandler.cxx
index 904273b94..36d53a489 100644
--- a/src/emucore/EventHandler.cxx
+++ b/src/emucore/EventHandler.cxx
@@ -237,6 +237,14 @@ void EventHandler::set7800Mode()
     myIs7800 = false;
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void EventHandler::toggleUIPalette()
+{
+  myOSystem.settings().setValue("altuipalette", !myOSystem.settings().getBool("altuipalette"));
+  myOSystem.frameBuffer().setUIPalette();
+  myOSystem.frameBuffer().update(FrameBuffer::UpdateMode::REDRAW);
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void EventHandler::changeMouseControl(int direction)
 {
@@ -529,6 +537,13 @@ void EventHandler::handleEvent(Event::Type event, Int32 value, bool repeated)
       }
       return;
 
+    case Event::ToggleUIPalette:
+      if(pressed && !repeated)
+      {
+        toggleUIPalette();
+      }
+      break;
+
     case Event::ToggleFullScreen:
       if(pressed && !repeated)
       {
@@ -3109,6 +3124,7 @@ EventHandler::MenuActionList EventHandler::ourMenuActionList = { {
 
   { Event::UIPrevDir,               "Parent directory"                      },
   { Event::ToggleFullScreen,        "Toggle fullscreen"                     },
+  { Event::ToggleUIPalette,         "Toggle UI theme"                       },
   { Event::Quit,                    "Quit"                                  }
 } };
 
diff --git a/src/emucore/EventHandler.hxx b/src/emucore/EventHandler.hxx
index 9d2453278..93e64acd1 100644
--- a/src/emucore/EventHandler.hxx
+++ b/src/emucore/EventHandler.hxx
@@ -98,6 +98,11 @@ class EventHandler
     */
     void set7800Mode();
 
+    /**
+      Toggle between UI theme #1 and #2.
+    */
+    void toggleUIPalette();
+
     /**
       Collects and dispatches any pending events.  This method should be
       called regularly (at X times per second, where X is the game framerate).
@@ -527,7 +532,7 @@ class EventHandler
       REFRESH_SIZE         = 0,
     #endif
       EMUL_ACTIONLIST_SIZE = 232 + PNG_SIZE + COMBO_SIZE + REFRESH_SIZE,
-      MENU_ACTIONLIST_SIZE = 19
+      MENU_ACTIONLIST_SIZE = 20
     ;
 
     // The event(s) assigned to each combination event
diff --git a/src/emucore/FrameBuffer.cxx b/src/emucore/FrameBuffer.cxx
index 38c18810b..9eef64bc9 100644
--- a/src/emucore/FrameBuffer.cxx
+++ b/src/emucore/FrameBuffer.cxx
@@ -989,11 +989,13 @@ void FrameBuffer::setTIAPalette(const PaletteArray& rgb_palette)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void FrameBuffer::setUIPalette()
 {
+  const Settings& settings = myOSystem.settings();
+  const string& key = settings.getBool("altuipalette") ? "uipalette2" : "uipalette";
   // Set palette for UI (upper area of full palette)
   const UIPaletteArray& ui_palette =
-     (myOSystem.settings().getString("uipalette") == "classic") ? ourClassicUIPalette :
-     (myOSystem.settings().getString("uipalette") == "light")   ? ourLightUIPalette :
-     (myOSystem.settings().getString("uipalette") == "dark")    ? ourDarkUIPalette :
+     (settings.getString(key) == "classic") ? ourClassicUIPalette :
+     (settings.getString(key) == "light")   ? ourLightUIPalette :
+     (settings.getString(key) == "dark")    ? ourDarkUIPalette :
       ourStandardUIPalette;
 
   for(size_t i = 0, j = myFullPalette.size() - ui_palette.size();
diff --git a/src/emucore/Settings.cxx b/src/emucore/Settings.cxx
index 92ee2c2b4..307ae6a72 100644
--- a/src/emucore/Settings.cxx
+++ b/src/emucore/Settings.cxx
@@ -181,6 +181,8 @@ Settings::Settings()
   setPermanent("dbg.display", 0);
 #endif
   setPermanent("uipalette", "standard");
+  setPermanent("uipalette2", "dark");
+  setPermanent("altuipalette", "false");
   setPermanent("hidpi", "false");
   setPermanent("listdelay", "300");
   setPermanent("mwheel", "4");
@@ -648,9 +650,13 @@ void Settings::usage()
     << "  -lastrom            <name>   Last played ROM, automatically selected in\n"
     << "                                launcher\n"
     << "  -romloadcount <number>       Number of ROM to load next from multicard\n"
-    << "  -uipalette    <standard|     Selects GUI theme\n"
+    << "  -uipalette    <standard|     Set GUI theme\n"
     << "                 classic|\n"
     << "                 light|dark>\n"
+    << "  -uipalette2   <standard|     Set alternative GUI theme\n"
+    << "                 classic|\n"
+    << "                 light|dark>\n"
+    << "  -altuipalette <0|1>          Enable alternative GUI theme\n"
     << "  -hidpi        <0|1>          Enable HiDPI mode\n"
     << "  -dialogfont   <small|        Use the specified font in the dialogs\n"
     << "                 low_medium|\n"
diff --git a/src/gui/UIDialog.cxx b/src/gui/UIDialog.cxx
index 78fa19730..bdebd6eef 100644
--- a/src/gui/UIDialog.cxx
+++ b/src/gui/UIDialog.cxx
@@ -83,9 +83,16 @@ UIDialog::UIDialog(OSystem& osystem, DialogContainer& parent,
   VarList::push_back(items, "Classic", "classic");
   VarList::push_back(items, "Light", "light");
   VarList::push_back(items, "Dark", "dark");
-  myPalettePopup = new PopUpWidget(myTab, font, xpos, ypos, pwidth, lineHeight,
-                                   items, "Theme      ", lwidth);
-  wid.push_back(myPalettePopup);
+  myPalette1Popup = new PopUpWidget(myTab, font, xpos, ypos, pwidth, lineHeight,
+                                    items, "Theme #1   ", lwidth);
+  myPalette1Popup->setToolTip("Primary theme.", Event::ToggleUIPalette, EventMode::kMenuMode);
+  wid.push_back(myPalette1Popup);
+  ypos += lineHeight + VGAP;
+
+  myPalette2Popup = new PopUpWidget(myTab, font, xpos, ypos, pwidth, lineHeight,
+                                    items, "Theme #2   ", lwidth);
+  myPalette2Popup->setToolTip("Alternative theme.", Event::ToggleUIPalette, EventMode::kMenuMode);
+  wid.push_back(myPalette2Popup);
   ypos += lineHeight + VGAP;
 
   // Dialog font
@@ -128,8 +135,8 @@ UIDialog::UIDialog(OSystem& osystem, DialogContainer& parent,
   wid.push_back(myCenter);
 
   // Delay between quick-selecting characters in ListWidget
-  xpos = HBORDER; ypos += lineHeight + VGAP * 4;
-  const int swidth = myPalettePopup->getWidth() - lwidth;
+  xpos = HBORDER; ypos += lineHeight + VGAP * 3;
+  const int swidth = myPalette1Popup->getWidth() - lwidth;
   myListDelaySlider = new SliderWidget(myTab, font, xpos, ypos, swidth, lineHeight,
                                       "List input delay        ", 0, kListDelay,
                                       font.getStringWidth("1 second"));
@@ -388,8 +395,10 @@ void UIDialog::loadConfig()
   myLauncherExitWidget->setState(exitlauncher);
 
   // UI palette
-  const string& pal = settings.getString("uipalette");
-  myPalettePopup->setSelected(pal, "standard");
+  const string& pal1 = settings.getString("uipalette");
+  myPalette1Popup->setSelected(pal1, "standard");
+  const string& pal2 = settings.getString("uipalette2");
+  myPalette2Popup->setSelected(pal2, "dark");
 
   // Dialog font
   const string& dialogFont = settings.getString("dialogfont");
@@ -478,7 +487,9 @@ void UIDialog::saveConfig()
 
   // UI palette
   settings.setValue("uipalette",
-    myPalettePopup->getSelectedTag().toString());
+                    myPalette1Popup->getSelectedTag().toString());
+  settings.setValue("uipalette2",
+                    myPalette2Popup->getSelectedTag().toString());
   instance().frameBuffer().setUIPalette();
   instance().frameBuffer().update(FrameBuffer::UpdateMode::REDRAW);
 
@@ -526,7 +537,8 @@ void UIDialog::setDefaults()
   switch(myTab->getActiveTab())
   {
     case 0:  // Misc. options
-      myPalettePopup->setSelected("standard");
+      myPalette1Popup->setSelected("standard");
+      myPalette2Popup->setSelected("dark");
       myDialogFontPopup->setSelected("medium", "");
       myHidpiWidget->setState(false);
       myPositionPopup->setSelected("0");
diff --git a/src/gui/UIDialog.hxx b/src/gui/UIDialog.hxx
index e3b7172bf..d67e24c84 100644
--- a/src/gui/UIDialog.hxx
+++ b/src/gui/UIDialog.hxx
@@ -66,7 +66,8 @@ class UIDialog : public Dialog, public CommandSender
     CheckboxWidget*   myLauncherExitWidget{nullptr};
 
     // Misc options
-    PopUpWidget*      myPalettePopup{nullptr};
+    PopUpWidget*      myPalette1Popup{nullptr};
+    PopUpWidget*      myPalette2Popup{nullptr};
     PopUpWidget*      myDialogFontPopup{nullptr};
     CheckboxWidget*   myHidpiWidget{nullptr};
     PopUpWidget*      myPositionPopup{nullptr};