Generally, proof nickels should have full steps. There can still be weakness, or even damage on an impaired proof, that would preclude even a proof from being called FS, but the vast majority of unimpaired proofs should have them.
Tantum religio potuit suadere malorum.
"Just because you're paranoid don't mean they're not after you."
My Want List: http://goccf.com/t/282022