Translate along x, y, or z vector
Rotate around x, y, or z vector
Translate (Pan) within xy, xz, yz plane
Within the Assembly environment:
Hold Ctrl + Alt and use MMB or RMB to orient the model
MMB – 3D tumble
RMB – pan parallel to screen
From a workflow point of view this is probably faster but less precise than using the 3D Dragger