First off: Hunting Lodge!? Tell me more.
Second: DevilsDan, that is a good point, vanilla client should be required, however I was also thinking (maybe a bit too optimistically) that if you can see other people’s names through blocks over long distances, hiding will be near impossible, SO I was curious if a Universe-Wide sneak hack could be employed. Again, this is unlikely unless anyone capable of adding mods to the server expresses serious interest, and nsanidy approves of the addition, but I want to get it out there just in case.
EDIT: Something just occured to me. I think plenty of players (mostly inexperienced ones) would shy away from playing if they had to modify their clients, should they have installed mods on it.