If you are using it strictly for introducing skin texture realism and enhancement to characters, it can be used as is.  However, if the model contains addition material zones not addressed by the VSSProp proper, those parameters must be added and assigned or they will be totally ignored. 

Here is the link to the original post created by bagginsbill:
http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2737823&page=1

It is fairly extensive, but it is the best location to grasp the conceptual idea.