I had an idea for a plugin to add this plugin could be a useful feature if you're going to custom make an anti-cheat or if you want to make a network. It could most likely be useful for much more than just that tho for example u could make minigames so if a player's game mode is that then you might have some way to change the world generation.
I think the plugin would be generally useful for different servers or if you want to make anti-cheats.
It has already been suggested.
https://www.cubedcraft.com/suggestions/view/1362-wolvsk