(Not talking about the whole desktop environment, just the desk, actually) You have plasmoids and a consistent layout. Nice. Then you have end-users, a bit clueless. And after a few month, their desktop is an absolute mess and they don’t even know why, it’s not even like they wanted to change anything to it. But you had set “lock plasmoids”. So you’re obviously locking for a way to remove the “unlock plasmoid” option.
You can do so following this advice:
Great! Except it looks like a dirty hack so I wonder if it will still work in the long run. I’d gladly take any further advice.