It would be useful to have a body/skin collision feature in character creator and iclone. When you want to express your character by having them stretch their face using hands, the fingers generally go through the mesh or they dont look like they touch the face at all. If you had a feature that allowed the mesh to deform accordingly to an object or its self then you could create better interaction.
I think I explained this enough but just incase I will give another example.
You want to create a character with some animation where it pokes another character in the arm and you see the finger pressing down on the skin without the finger going through the mesh.