Due to testing issues the cheats for the PPC version of THPS2 were never enabled.
On the other hand, the PPC and Desktop PC use the same binary layout for saved games. So, if you cheat on the desktop PC and move the saved game over to the PPC, then you do just about anything.
Ex. go to skater's heaven or be Spider Man(tm).
I've done both because I'm the ultimate haxor.