It worked back before one of Bioware's patches broke it. Talon used some wacky server extensions I believe.
When it did work it the wings and tail only stayed for as long as the player was logged in. As soon as the player left the server (even if they exported their character after getting wings and a tail) they would lose their wings/tail. So it really isn't a good solution for a Role Play server since the players would have to re-add wings/tail every time they logged in.
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Hmmm thats what I thought. One of Talon's server extensions. However, by that logic, his server extension were probably able to read the character files, but obviously could not write to them because they were not local, which is not the case on a server vault RP server. It probably could be done because a server vault stores character files locally. Interesting, you'd have to talk with Talon further, but i believe it could be possible.