The ability to set pivot points and orbit a model directly from the use of mouse button combinations, without having to select the Orbit icon or use the View Cube (which itself is a nice feature) would be very useful. Complete model viewing manipulation (zoom, pan, rotate/orbit, set pivot point) using only combinations of mouse buttons, is very common in other CAD Systems and even some viewing applications (e.g. 3D PDF in Adobe Reader and Acrobat), although Fusion 360 already includes mouse button support for panning and zooming
Simultaneous 1st then 3rd, or 2nd then 3rd mouse button combinations appear to be available.