I don't think there are too many troublemakers. Anyway, wlk, I just added a small line of code that adds/removes tokens if i > 25 and says something like, "Slow down thar laddy!" if you try to do more. I don't think people have found other ways to crash GCCG. Cheat, yes, crash, not yet.
EDIT: You could always make the error a "Say" where the player pompously declares, "I just tried to add 100000 tokens!"