Quote - Because skin is mostly red, so the amount of precision in the red channel is greater than the other two. The goal is to detect body and facial hair (which generally is darker than the skin) and not apply skin-style specularity there. This is not a perfect strategy and is only included because the vast majority of skin textures do not include a skin/hair map.

If you wanted to disable this feature could you set the component to say 5? The only reason I ask is if your texture has no hair on it. Or is it better to just remove the node entirely? Or maybe I should just leave it on if it won't hurt anything?

On a side note, you wouldn't happen to know of a chat room with lots of Poser related 3D discussion and techniques, where everyone is collaborating to improve the quality of their renders?