Instead of having a new game mode (which would probably make it harder to find a game) they could make a mirror random mode. Have it so that players are randomly given a ship but the the ships used have to be the same as the other team to keep it balanced.
What age is after modern day time? I always kill the enemy, no matter what difficulty, when they get stuck as medevil and i get all the way to modern times. (Hint: hardly use the special unless absulotly nessisary, and use mainly infantry followed by support, don't rely on armored units)