I'm think this is good idea, if to on in group "colours" rdb hex editor (default skins). This will facilitate the desired choice of paint by typing the required rgb-code. And change in real-time, after enter a values. PLS.
But it has something to do with bitspace and incompatible replays and InSim systems I guess. Maybe a chance when the tire system gets updated, if ever. (then about everything is incompatible).