Yeah switch, I can imagine how frustrating it must be. We've had outfits follow us around and ruin our fun by using the /who command in the past as well, it's a good thing the feature no longer works.
As for TS, I can't imagine why someone would do that. You can solve the problem by setting your outfit channel to Registered and creating a new Default Entrance channel, that's what we use to keep unknown unregistered visitors away.
It's a hassle to move in squadmates, non-outfit friends and guests all the time, but it also ensures that everyone knows who's present.