This might be an unusual request, but I think it would be nice to control the camera with a gamepad controller like the xbox one controller.
Orbit, Pan, Zoom functions should be mapped to the analog controls. Visual styles (Wireframe / Shaded) should be mapped to a button.
Sometimes it's just nice to be able to admire your work in a casual way. You could also hand the controller to clients or other designers so that you can collaborate on the design.