As Animagic says, should be POSSIBLE now!! ;-)
I believe with morph animation in iClone 7 this can now be realised.
Just saw this. Voted!
Some good ideas there. Breathing is emotion - but it is, I suggest, mostly in the sound rather than the motion. Do you remember the alien monster chasing Kirk in TOS Startrek? "Do not run, captain, (gasp, gasp). I will be quick. I will be merciful (gasp, gasp).
Just like "Face Keys" there should be "Body Keys" as well. This can be useful for so many uses: Breathing. Transforming into the hulk. Arm flexing. Getting a lump from a sting or hit. Cartoon flattening. Bodily damage, injury. Overeating, bloating. Timelapse animation. Changing into a monster. And so many more uses.