I tend to agree with Damien on this issue. As server Administrators/owners I believe they should have the ability to ban hackers/stalkers and people who generally annoy a group of players for a time that the Administrators decide is right for their servers. I also disagree with your comment about IPs generally changing after 30 days. I know of many, many examples where that isn’t the case and this feature now will create more work as the people that have been banned for what the Administrators see as good reason, will again be able to access that particular server.
Please don’t think stalking doesn’t happen. It does and its not a pleasant experience.