If the magic rock is a cheat then I've cheated every single day... but seeing as it's something that doens't require game tweaking i guess it is not.
We don't even have Action Replays here so I've never been able to ever cheat on a game that does not have them built in.
Which is just as well because on Sims and Oblivion i'm obsessed with mods and cheats so it keeps my game nice and pure.
Time travelling ruins the fun and I would never do it.
Plus I'd lose all my hard-collected neighbors like Coco the rabbit-oid and Ribbot the robo-frog =O