Lars, Don already changed the security context root to -4 from 0 so
that's not an issue (if you look in the permissions screen for a new
site you should not see any direct permissions on 0:
http://yourdomain.com/permissions/one?object_id=0 ) I don't see
anything in the way of doing this other than fixing some of the
screens to edit personal data so user_id 0 can't edit their own data.
