So imagine a command in which you can make life easier hosting games.
1. Group typing for games. When any skin competition starts or a race, a person usually wins the game, it would be easier if the server had a reward option in which so you can reward a person without getting them into a spot without other players to snatch the items.

2. Broadcasting. A host has to have his/her players to know what's going on instead of not being able to see their messages when a lot of players are on. Maybe you can broadcast to the whole island to make it easier, you can start games and end them. You can also announce winners with them, an idea I have is /broadcast {message}

 

No support. The reward command would most likely be difficult to create, and I just don’t see it becoming very useful. Players could also potentially use it to trade illegal items, unless the developers created a new system that monitored what was being given through this command. There are plenty of other ways to give other players items, without the possibility of the items being stolen, if you are careful. For your second suggestion, you can type /cl in game, and all of your messages will be sent in local chat, which only allows players near you to see the messages. Messages sent while you are in local mode will also have a special prefix, allowing players to easily differentiate local chat from global chat. Type /cg at any time to return to global chat.