I just got this game and have been playing it with a friend. It's very enjoyable so far. I don't have much feedback to provide on balance yet, but I can already tell this game is very well suited for more than 2 players. I don't believe it would be too much work to implement and I think it's a feature that would greatly enhance the enjoyment of the game.
I know someone already mentioned this, but I wanted to stress how important I think it is and reinforce it with another request for it!