Thank you! I actually asked Keen to consider adding this as an official feature — including the ability to change detail colors using the paint gun, and maybe even make them emissive. Let’s hope it happens! If you like the idea, feel free to vote for it on the official SE2 support page — the more interest it gets, the better the chances!

https://support.keenswh.com/spaceengineers2/pc/topic/48646-advanced-paint-gun-modes-and-enhanced-block-customization-options

Very nice, great idea. Looking forward to future versions! Maybe slightly emissive colored details?