I don't think this is something we'd want to change as it would allow members to remove all their content and generally disrupt the flow of the forum. It would also allow spammers posing as legitimate members to go back and edit in spam links.
In addition, as per your second request, I've decided to move the entire thread to a hidden archive. It's old and it would lose context if I edited out all references to your forum so removal seems the best option. I hope that is acceptable.