Gal, coloring a certain projectile wouldn't work, it works for the mines because they are not projectiles, but vehicles.
And the pre-colors would be hard to do. How would you tell the color that the colorset might have? And most servers gave painting disabled, because if some has their trust, and most colorset's first color is red, if it was disabled, then bunches of red smoke would be good.
But having maybe more items that have different colors would work.