if you edit item.edf basicly nothing happenes. It used to work but not anymore. there are 2 item.edf files ; one in server and one in your client. purifierA.dll and B.dll checks if those files are same or not. If they are not same, server ignores your edited files and runs its own or disconnects you.
Of course there are or were some ways to avoid those DLL's like pasting the files at loading screen right after the cinematic. BTW there are labels of those files when you edit them check if their verions and edit dates are same as original ones. that may help you as well.
I am not quite sure if that works anymore, havent been playing for 2-3 years.
But dont give up trying, most of the cheats came by insane ideas of curious people.