Maybe not change, but remove. My only concern is that a user will get a hold of another (potentially higher rank) users UUID and then register the other persons UUID as their own to knock that person out of their actual higher rank. This would then lead to a situation where I can not ban the user because it would ban the actual legit user, and I can not fix the legit user's rank in TS3 because the integration would just knock him back down.
Also, question as to how the ban works. Does it just ban the UUID or does it add a ban for the IP as well? I ask because it is very easy to UUID spoof to avoid bans, not AS easy (but still somewhat easy) to bypass the IP ban.