I LOVE this gamepass, it's so fun to be able to colour my plasma a purple colour, or make some cool houses with engineer.
But a quick quality of life change that would save at least a little time is to add a mini hud in the corner so you can quickly switch between colours and materials to make cool builds a little quicker.
ALTERNATIVELY
Make it so you can choose DIFFERENT materials and colours for each seperate items to make it so you can make some cool builds. (This would be harder to implement than the other one, but would be a LOT cooler)
-# (By the way, please give feedback on what I should add to this suggestion!)