You guys are programmers... I don't think I need to explain this much.
Just a tab, similar to the one in Kerbal Space Program, that allows you to save pre-configured collections of parts.
Also... would be nice if it spanned saved games, but would love to have it even without that.
Would really like to build my next automated probe w/o having to repeat all of the "hover if" and "flip back over if" logic from scratch