I dont quite see the problem, if the face normals are pointing like you want, does it really matter what way the UVW normal is pointing? Personally I have never gotten any problems with any uvw normal pointing the "wrong way". To be quite honest, I didnt even know they could be the "Wrong way"^^ Its either mirrored or its not.
If you dont mind me asking, what problems is this causing you other then the UVW normal being the wrong way?
EDIT: You know you can mirror, scale, move, rotate the faces etc etc in the edit window right?