Give users the ability to tweak the navigation system of ZBrush. This will help break down the entry barrier of new users. Camera modes for Maya, Max, Softimage, Etc.
ZBrush needs to have a true front, left, right, back, top, bottom and 3/4 camera view set up. You should be able to easily be able to select these cameras, duplicate them, manipulate them, store views for each one of them, add image planes to each camera, and even set keys for their positions for presentation.