[admin]

It is meant to be that way. The skin extend and cut back brushes are meant to be for selecting skin or not skin. There isn't such a thing as see through skin, so that's why there's no opacity slider. If you want to tune the amount subtly using the touch up and restore brushes which do have opacity controls, then having a wash over your picture will obscure your results making it difficult to see what you are getting. Does that make sense?

Tony