Some practical examples for new users of ZBrush on the many uses for transpose rotate for modeling purposes.
For this method to work well you must have a good level of mesh resolution or subdivision as well as a soft mask.
NB: Blur the mask by cntrl clicking on the mask.
Another suggestion although not demonstrated is to use radial symmetry for sweeps in all directions.
I added this video simply because most information for transpose rotate tends toward limb posing rather than common modeling uses.
see also vimeo.com/52831516 for using the alt key with the transpose tool.