Insta-ban players who enter the MW arena without joining a team first.
Hackers who fly hack into the Missile Wars arena without joining a team first is extremely irritating, especially because they can infiltrate a private 1v1 or 2v2 match and there is nothing the players can do about it until staff comes on.
The only way to enter the MW arena without first joining a team is by hacking (one can ensure this by placing barrier blocks all around the Missile Wars lobby - therefore the only way to get in is with noclip). Therefore, the system should auto-ban players who enter the arena without joining a team.