Player Colours.
In earlier Age of Empires games, you could choose your player colour. But since this is Relic, i thought they could propably go the extra mile.
In another of their titles, the Dawn of War series, the player could design their own Army colour scheme. Why not be able to do the same here? Design your own Heraldry, as well as the Colours your Civ is going to have In-game.
I'm not expecting this to become a reality, but it sure feels good to get this out here :P