So, in the last week some people came to me asking that they wanted to troll their friends in their server and when they ran /itemdrops on, that turned on the Increasing Item Drops for everyone in the server, so that put forth the issue of turning on Increasing Item Drops for one person or several people at a time.


Increasing Item Drops w/ Adding & Removing
Now, you can run /itemdrops add <username> to make them an Increasing Item Drops user and you can run /itemdrops remove <username> to make a person get regular drops.


Note: If multiple people are Increasing Item Drop users then if Person A mines a block, they get 1 and if Person B mines a block they will get 2.