I’m basically turning this post: http://gardensofgonzo.com/forums/topic/specific-object-permissions-for-specific-player/ into a feature request.
I think it would be great that, aside of Everyone/Only owner can use, we could also set up black/white list of people who can use specific object (per character name basis). So e.g. one could become a landlord, renting housing space for people who can’t be bothered to build their own.