The information on the Second Law seems entirely geared around total transformation, and the resulting impact on the victim's psyche and therefore free will. That is, if you turn someone into a cat, they will think like a cat, not a person. And if you try to fit human thoughts into the cat body, you end up with a different set of problems. Nowhere does it mention more modest transformations, such as ... ahem, personal enhancement, or maybe clawed hands or some such. Those sorts of changes are much more asthetic than pervasive, and other than perhaps opening up new vistas in ones personal life, it doesn't seem as though it would have any significant impact on the victim's free will.
Bottom line -- if it doesn't destroy the victim's "self" or remove free will ... is it a 2nd Law violation?