I absolutely HATED having 3 or more toolbars - having to press X a certain number of times based on which toolbar I currently had to cycle through the one I'm looking for absolutely drove me insane. This mod lets me have 4 bars without pulling my hair out

I am glad you like it! I've had the same issue, always avoiding the extra toolbelt research in say Bob's, because it's just too annoying to not have quick access to 2 quickbars at any time :).

If you have any suggestions for improvements, feel free to let me know.

And updated for 0.16 now, which finally gives an API which lets me implement it hopefully bulletproof.