I'm okay with the current 4 member party, but I wouldn't be against options where you can go out as a party of 2 or 6. They could adjust the number of actions we have or just enemies' health to fit your party size. Balance would definitely be the big issue. If I am going out with a party of 6 though, I would like the AI to do my companions turns just to speed the game up. Maybe incorporate a tactics system similar to Dragon Age.
