... i still want an example of something you couldn't do. because i'm quite certain with a little creativity the separation between where and what can be ignored.
Something/Anything that affects another world. That's the idea, at least.
that's why i don't think that limit will do anything, and i was kinda offended that you blew off my question with a simple "it's common sense". if it really were common sense i wouldn't be asking the question.
You misinterpreted my answer. I meant that common sense would be used to determine the answer in each case.
The biggest problem is that the issue you bring up is fundamentally one of loopholes; "How do I make something I want to happen happen elsewhere without changing anything there?" There's no single answer that stops all issues.
Another problem is, of course, that any avatars or other things we can directly change/add to have this same fundamental problem.