This one is more than likely for Paolo since he knows his product best.  I recently got Jepes Jewels and Tears V4 here.  Not sure if you're familiar with how it works; but I can basically sum it up this way.  You create a geometry shell for your character and then apply one of the settings.  The one I've tried so far is the water drop option.  It basically covers either the whole body or whatever section you select like arms or head or neck or collars.  When I did a quick test render in 3delight it worked perfectly.  What it basically is is a spec and bump map applied to either the whole body or body part you choose.  When trying it out in Lux, the geometry shell shows up with the appropriate maps applied; but there is no difference in the render.  Plain ol' dry skin.  Any ideas on how to make it work in reality/lux.