Cruentus
Grandmaster
they would be an effective weapon. Clawing is very different from scratching.
If, for example, you're jamming your fingers into your attacker eyballs as if to scratch the back of his skull through his sockets, then I would argue that you are attacking with your fingers and entire body (that is behind your "claw"). Nails may slightly multiply the force, but in most cases they aren't really what makes the tactic work.
Paul