I got some requests that maybe are interesting for your mod.
- /afk command
A player can use this command to mark himself as afk. Sends a global message "<player> is afk". Maybe change hover Info from player etc. - /tpa <player>
Do not teleport to a player directly. Send him a request.
He can use /tpaccept or /tpdeny to response the teleport request.
If teleport is accepted teleport player. - /tpahere <player>
Similar to /tpa but this will invite the player to teleport to the user, that used this command.
(Other direction than /tpa)
More information: https://www.minecraftsquare.com/wiki/index.php//tpa