The pitch does not start until the hands are brought together. They can do pretty much anything they want up until the hands touch. Facing the plate, being turned sideways etc has nothing to do with it. Standing there holding the ball and spinning it in your hand does not sound like any kind of pitching motion anyway.
Incorrect. The pitch STARTS when the hands separate...NCAA and ASA rule sets.
NCAA 10.3 The pitch officially begins and cannot be discontinued once the hands have separated after coming together.
ASA 6.3 STARTING THE PITCH The pitch starts when one hand is taken off the ball after the hands have been placed together.