In that case you're suggesting a teleport check function for Titan, one for Garuda, one for Ifrit, and so on. That's even more prone to error as you're maintaining hundreds of functions that has to be updated each time a player gains a new movement aid ability. I'm sure all MMORPG do look for any unusual changes in position, but you cannot judge solely on that. There has to be a guy who actually looks at your log to determine if you're really teleporting or if it was just a false positive, and that stuff takes time and certainly cannot be done in real time.
