Wouldn't it be magic if while running around a facet that deprives you of stamina when you push through beings, you could avoid the 'hidden' ones on your side? Could it be worth pursuing the idea of *ghost grey* guild members or allies that are hidden? how about thieves in your guild stealing your stuff in trammel? war yes, guild or ally, no. too far? i think its long overdue.
I also noticed a stink-less change to spawn not attacking you through walls. perhaps its time UO introduced the 'Fog of War'? Why can we see through walls? FOW would add a sense of reality and discovery.
what do you think?