This has bothered me since I noticed it, and I don't think I've seen it addressed in any of the updates.
The Supernatural Creature cannot attack anything while in human form. They have a Creature Powers skill, but they explicitly can't use their creature powers while in human form. No martial arts, no guns, nothing. And this really bothers me, because if I've got a supernatural creature trying to masquerade as a human or not call attention to himself, then he's screwed once combat begins. I guess you could use the Universal Default of 7, but that seems like a horrible thing to do to a supernatural creature that is just trying to take part in the fight like any other normal human character.
I usually slap a Martial Arts 12 or Guns 12 on there automatically in chargen (player's choice), or give the Supernatural Creature some bonus skills to do something interesting while human.
I'd actually like to see this changed with some errata. Anyone else have problems with supernatural creatures trying to act like humans?