With 2.1, you can change the width of the quickbar. I quickbars of width 20 now, and it would be nice if this mod can also use more of the quickbar slots.

Interesting, I didn't know about that, I might take a look, thanks for the info! If it can be accessed through the modding API then I should have support for it out soonish.

Just pushed a patch that should enable the use of extra width quickbars, I did some testing on a width of 40 and I'm pretty sure I didn't break anything in the process. If you encounter any bugs, please do report back and I'll action a fix.