We recently played with 7 players...
why not play 2 campaigns with 3 and and 4 players. Getting 7 people around the small maps of IA does not seem like much fun.
Splitting the Imperial side up does not seem like much fun to me as decisions for upgrades and deployments ect. is going to be made by one person which puts the other players on auto pilot for their designated squad and I could not stand being one of the auto pilot imperials.
There have been some nice suggestions for adding more players though many have balance issue, I do really like the idea of using allies to add a 6th player but beyond that I would recommend breaking into smaller groups or playing a different game.
Edited by apbevan