Quote Originally Posted by Canadane View Post
I've been told that's exactly how WoW's blacklist works. Nothing is impossible!
It does not.

WoW's ignore function prevents you from seeing messages from an ignored person and prevents you from being put into a cross-server party/raid with them. Nothing more.

From a programming standpoint, doing what's being asked for here isn't IMPOSSIBLE, but it's definitely tricky and would put a lot of strain on the client for really not much gain since there are already effective avenues to deal with harassment.