Boozebeard,
The nice thing about the basic materials is that there are so many variables at your control that you can create innumerable new materials. You have the freedom to change their settings to suit your need. Now, if editing materials and shaders is new to you, I admit that it is a steep hill to climb. If you are curious enough, you will figure it out, and you will have a leg up on many other Zbrush users in the community. This is a sadly overlooked area in the Zclassroom training. I still struggle with it myself. But once you get your feet wet, it is kind of addicting. Who knows, maybe you will be the one to start a new download section for custom basic materials! Start with something simple, then move on to the double shader, and so on. Exploration is one of my main battle cries to my students at Studio Arts in L.A. Try to get back to the mindset you had when you were a kid. Kids start button mashing and horsing around, because they don’t pressure themselves to be a genius. They are just fooling around. " Wow, I wonder what this slider does?" No pressure. That is where most major strides happen. Try it out. What can it hurt?
Derek