I have wondered why we couldn't have more options in the lobby. For example, each arena has the option to join rook, bish, or knight depending on how many are on one team.
Late War Orange--Rooks-100/100
Bishops-98/100
Knights-78/100
This way you could see from the lobby which side needs more numbers. I guess this would be a problem with people logging out in order to change countries, but if it were regulated, it might be a way to help with arena caps, also.