I can't help you with the rigging question--no idea if that's possible or how it would be done. But morphs can create changes in the mesh, like you're talking about with the wrinkles. I've done this to create some subtle changes in one of my characters' expressions and make him able to breathe and swallow. Simple version is I used the Mesh Editor or the head morphs to change the mesh in CC3, exported the various morph states as iAvatars, then brought them into iClone with the Morph Creator and animated them with the Morph Animator.
It'll try to make a video showing how I did it. The first time was hard, but now that I've had practice, it's super simple.
Maybe some one else can answer the rigging question, but I'll do the part I can.
:-)
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