Some random idea I got from a DayZ bug which I will explain now.
-If you join the spectate team, you would be visible to other players on the server, except you would spawn as a fly (idea gotten from Smokin' Guns) or maybe a bird.
OR
-You could spawn as a evil rabies carrying killer loner mad wolf that has razor sharp dirty poisonous teeth intent on killing deuces.Don't take this seriously.