CotG hack in two CDs?

[Tenkarider]

I don't think it's a good idea patching part 2 on a rom already patched with part 1: chances the rom will explode are almost 100%

Clearly i know there's no way to stop some good hacker from hacking with hex, unless there's a way to put a password on the rom when someone tries to open/edit it with hex editor...
for the others should be more than enough that anti cheat trick... in any case tracking down the progresses with a battle var might be a good idea, for triggering certain events/battles in a certain moment of the game.