Playback speed bar

[Archeix7]

First of all, I apologize that this is again a "bug" and not a "query", I do not know how to label it differently.

I propose to make a bar speed playback, instead of options 0.5x, x1, 1.5x, etc., so you can much finer set the desired speed playback (also propose to expand the range to 3x)