Exclusion Vertex groups for Collision objects

I would like to have the ability to define a vertex group for a collision object that would exclude the specified faces from the collision calculation in a cloth simulation. It would operate the same way as the vertex group that is specified in the Object Collisions section of the cloth simulation panel. (i.e. Faces that have all vertices assigned to this Vertex Group are excluded from collision with cloth objects.) An example would be exclude a figure's hands from collision with all clothing on that figure. The ability to do this on a per cloth basis would be a bonus.