Fixed area width or fixed grid size

[nalimovm]

I'm using nightTab as my main page with speed dial for frequently visited sites for two years in all my browsers and it's truly awesome (now in safari too thanks to @samrth012). The only thing bothering me is that there is no way to fix the width of the bookmark area to a certain value in pixels or set the exact number of bookmarks in row in grid.
For example, i like when my grid has 5 columns in it, i've used to it for a decades, i know exactly where all the things are, but sometimes i need to resize browser window and everything starts to shifting in an unpredictable way.

It would be great to have the ability to either set the exact grid size (i.e. 5x2, 5x4, 2x6) or set the fixed width of the bookmarks\layout area (maybe with switch between flexible in percents and fixed in pixels or in percents of my whole screen width).