Sure it's easier to just mod your playstation but I've been messing around with gamesharks and Game Enhancers and Gold Fingers ect. Any gameshark disc or 0/1 Port Gameshark will allow you to play copied games example.
Gameshark CDX you start the game with or without the codes you chose and the disc spins slow then fast then slow again as soon as i spins slow again you take it out fast and place the copied game in and spin it in the right direction as soon as you put it in.(You have to be quick with this) Its the same with the port gamesharks too exept you use a real non copied psx game and when it gets to where you start the game before you press x to start it you take out the original disc and then put in the copied disc and spin it.(Still have to be quick) The 0/1 port Game enhancer/Gold Finger ect. is easy to use you put your original psx cd in it spins and then stops when it stops you take it out and put in the copied game then press start game.
With Gameshark 2 V2.0-2 the gameshark spins and reads the disc and when you goto the start game menu it stops spinning you take out the gameshark and put in the copied game and press with codes or without codes and it plays your game. :madhack:

hey man i was thinking the same thing but i want to find out if an exploder cd9000 will play forien disk because when you go into the select cheats menu if you press select you can change the region of the disk only to american and german though i have not tested it so if you do test it let me know cheers :round: