I just tested this on our server with the hook running. I was given a message that I would be kicked from the server in 5 seconds etc.. but no information about why I was being kicked was sent to any other players in the game.
This means that it just appears to others that I have left the game, rather than being kicked by Qval. If I was using the hook for real, I could just then turn it off and come back to the game and claim that I just lagged out.... happens often enough with UT - no one would suspect a thing.
Why don't you make it spam in the console that someone has been caught with the hook or something? The software is very nice, the prevention is great - but we wanna catch people who bot too, not just stop them from doing it.
Other than that minor thing, you've done a great job
Good job prof Q, and Xfire
