Wereparrot...love it.
Just throwing in my own confirmation...yes, "smarts"-related stats can go down when in beastie form, and up is either right out or only with really good justification.
As for circles and such, as stated, unless there's a scene aspect that might state otherwise, I'd rule it working like it would on mundane ol' Terra, although I might also rule some of the Nevernever denizens having a boosted strength on their home turf against a pesky human wizard's magic circle...