It probably would never be used anyway, but I really don't see the point in having IDs be unique for the clients since with that, you can easily get away with being a complete douche like I am most of the time while being able to essentially completely reset all of the negative "trust" shit people may have incredibly easily. Why not just keep blacklists and what not? I have a feeling this would end up being even less effective than Brahma's anti-cheat stuff.
Edit: also, I think something like this would be more appropriate here since it doesn't actually directly deal with blacklists/whitelists and what not.
Edit: also, I think something like this would be more appropriate here since it doesn't actually directly deal with blacklists/whitelists and what not.