Support, but how would you, say, take an image of your unit with that team color? It'd be better off with solid, simple parts like the backs of buttons being that team color, unless you want to manually modify that image... Perhaps taking a page from Silnarm's book and using 2 images (like faction logos) to create both transparency and teamcolor? Abet, it seems a bit complicated, but works at least...
Then again, I don't know of any mods that use transparency in their buttons??