I would really like to be able to set individually who can port to me. I have friends that are young and tend to port at the worst times. And then there are the people who ask before they port. I don't want to have to turn it off altogether.
Also it would be awesome to be able to leave messages for people who are offline. Maybe put a mailbox in the houses?
One more idea. I really, really want a Headless Horseman spell for death. That would be amazing!