At the moment I have the most used building elements bound to the actionbar
- Electric poles, foundations, belts, splitter, mergers.
This takes up the keys 1-10.
I find myself still looking up all the other building elements in the Builder menu. It would be great if we could have more action bars to also assign F1 - F10. And preferrably allow to add more actionbars with modifiers. This could possibly allow that "3" is Conveyor belt MK3, and "CTRL+3" is Conveyor belt MK4, and "ALT+3" is Conveyor belt MK5.
Would improve Quality of Life, as constantly looking every element up in the Builder menu is starting to get tedious. Love the game though :)