I don't think this would actually work, but I always liked the idea of a game large and small scale battles. Like how in Advance wars your units represent a small group of soldiers (1 soldier unit = 10 soldiers). You would fight large scale battles like advance wars, but once you got into a fight instead of having 10 soldiers duke it out, you would have 10 playable characters and the fight would play be another, smaller battle, like you would fight in a fire emblem game. It would be difficult to implement well but I really like the idea anyway.