I cant seem to find anything about this, or it hasn't been brought up. my server has permission set so all admins are vanished when they join, but the players can do /list or /who then we are revealed and they point us out. this is annoying as we like it so people dont know we are even there, unless we talk in chat.
can anything be done for this?

Your plugins providing /list and /who are not utilizing the Bukkit methods to determine if they can see another player.