ezskin 1.7(?) creates one scatter group for the inner mouth parts and another for the rest of the skin. This eliminates the dreaded blue tinge around the mouth. I think it's a great advance along with the new scatter groups in SR2.

 

This is his page http://snarlygribbly.org/3d/forum , but i just got it in this forum at the end of the thread about ezskin.