What if you joined in a spectator slot instead of in a ship slot?
I thought of that, too, but there's no way switch from spectator to participant in the middle of the game. Also, you'd almost certainly end up with most new players waiting to see which team's winning, then joining them. (it's like that in TF2, and I
totally do that there) Also, you could join as a spectator, look to see where one side is, then join the other team and give away their position. Ambushing is pretty important to a lot of builds and ships, and I'd be worried it would unbalance that. (I suppose you can do that now, with a guy in spectator mode plus teamspeak or whatever feeding you information, but if your side is
that organized you're probably already going to win)