i think just the right side works for non shield too..
i got a question too, do amulets like: "gives x% more defense from blocking with shield" (or something like that) work for not shield block to?
Seriously? If it specifies "gives x% more defense from blocking with a
SHIELD" why would it work for anything but a shield?
As for the topic, to my knowledge, the blocking perks only affect shields.