Lets be real, every player who plays GunZ and mainly CW, when loses accuses the other of hacking because his ego is butthurt.
With the often updates JP does, addresses change in short so if there's a program out there that lets people sb and shit, they'd need to update all the addresses so it works correctly with the newest update, I honestly doubt there are people out there wasting their time on a game that's not competitive anymore, GunZ isn't what it used to be back in 2008-2010 and even if there were cheaters, all you have to do is report them, whether they are legit or not, if the said player is hacking, he won't get away with it (admins are experienced enough to realize who cheats and doesn't).