6) after a player is eliminated you cannot launch attacks until of the eliminated players territory has been recaptured by someone else
So technically, if there are no attacks on the outposts when they are eliminated/resign, there is no way to get that outpost again?
More ideas:
-only public chat. So do you say allies publicly, or no allies at all?
-choose specialists, but after every hire/promotion it gets randomly swapped with someone else's specialist. Potentially with one on a sub attacking someone.
-automatically seeing the entire map. It happens in small games a lot, but being able to see the entire thing in a 10 player game.....
-actual teams. No backstabbing, if you send a sub to your team it will change to a gift no matter what, etc.