Wild Shape (Su): (...) This ability functions like the beast shape I spell, except as noted here. (...)
Feather Subdomain (...) In addition, whenever you cast a spell that grants you a fly speed, your maneuverability increases by one step (up to perfect). (...)
Would that power of the Feather Subdomain apply to the Wild Shape? (To be on the safe side, I'd guess not, but I want to make sure.)
The "(Su)" part after "Wild Shape" means it's a supernatural ability, and thus per definition not a spell.
Yes, but it functions like a spell. Is it confirmed anywhere that this amounts to nothing?
I don't believe it interacts in any beneficial manner. To my knowledge, it is not explicitly stated anywhere, however.
Yes, but it functions like a spell.
"except as noted here", which includes the "(Su)" tag. "Supernatural abilities are magical but not spell-like.", and can not possibly trigger the "whenever you cast a spell" condition. If wildshape was a "(Sp)" (i.e. spell-like) ability, it would work because "Spell-like abilities function just like spells".
