This is not a very important suggestion, but it would save some time and hassle for players. Sometimes when I play Skywars with friends we join different games when hopping into the portal. When we want to leave we have to go all the way back to the hub and rejoin. Sometimes there's not enough time to join one another's game. It would be much easier if you could leave a Skywars game by using /leave After using it you would return to the Skywars Hub not the main lobby.
