Indeed it has been made already, however, these are global and do not include item deleting for example.
A Slayer-minigame option for this would be cool so you can still throw eachother tools from outside of the minigame (to buidl together) while those in the mini can't, to avoid any class-specific weapon switching out hassle.
I would like to see this happen, but of course, if you don't see a purpose for this i can fully understand, since indeed something very similar already exists.