This is a server-side mod that allows only a single person to play, while the rest spectate.
/oat next- Switch to the next player in the queue./oat switch [<player>]- Switch to the specified player./oat maxtime- Change the maximum time a player is allowed to play./oat reset- Reset the time of the current player./oat queue list- List the queue./oat queue shuffle- Shuffle the queue.