Nice idea. Though I wonder how the command would work since with /leave you're usually in a queue to join a class or a game. Would it get complicated to create a /leave command just for mazes whilst using the same function that /leave is currently used for? I wonder if they could use /kill as well, but make it so that it doesn't affect gear items whilst in the maze.
Either way, I agree that a command would be useful for players to use in a maze if they are lost or need to get out - without having to use a warpkey bag.