Entering Specific Lobbies

Face it, it is always a pain to have to keep rejoining lobbies or go into a lobby, reach round four, then go out of the lobby and then join the lobby that you want to join (or if there’s another lobby you joined redo the whole thing). Can’t there be a way to join certain lobbies via ID? For example, /j z 214523. It would take care of annoying business when the player can’t invite you.

Either that or being able to whisper to the player in zombies so they can invite you.