I think we seriously need an option to host pvp games.
Tournaments will not be possible at all if we can't and it is just the right thing to do!
I suggest having an option to make a PVP arena invite only (like PvE solo maps) w/o having a booting option as it won't be necessary, hence the INVITE ONLY.
To avoid people abusing this system to obtain easy Flag Captures, the same rule of 3 players on each side will stay in place. Also, if you are to leave the game and you are the only one there you cannot rejoin it. You must make a completely new arena. This way, in case the ability to stack still works, you cannot force the start of a game.
Finally, if you are in the middle of the match and for some reason people leave and the game is left 2v2, the match should automatically end and show the score; to further prevent abuse of game hosting.
This is subject to more ideas, but as of now this is it.