Totally! I had this in mind as I was creating the "Painter" tool in the workshop. I stopped work on the tool once it was (barely) functional, but this is something I would like to get back to.
Some people have been completely sidestepping the painting issue by designing with colored custom shapes. Check out Arcane's incredible work on GameTechMods:
https://gametechmods.com/forums/robot-rumble-2-0/post-your-bots/80/