You can’t do that mate. For a start the vast majority of those leaving early now won’t be bothered about points anyway. For a second it’s impossible to stop abuse. For a third you can’t discriminate against people with disabilities and genuine reasons for leaving early. Also and much more significantly you’d have to build in a whole new layer of technology and crowd control and that’s never ever going to happen for such a trivial issue.
I really don’t see why people get so upset about it to be honest. The support matters during a game, not when it’s over or effectively over.