I think a cool idea would be some sort of map creation system, maybe you buy a 10$ DLC off the steam store and it lets you make maps that you can play on with people that have the join code.
I mean it's just part of the game to get imposter like 5 times in a row
But ONLY for Nintendo Gamecube
I think it should be an option when you create the server, like a toggle switch for show join code to guests.
