It would be nice if Zbrush gave an option that allowed you to set up how your mouse buttons functioned to move around your model. For instance, set the middle wheel button when pushed down to do the orbiting and the wheel to move in and out of the model. Also wherever you pointed the mouse as you would scroll, it would zoom in and out on that position. Just like sketch up. Is this possible? If its not, it needs to be. For me, this would help to learn Zbrush. One less thing to think about.