T o d d P a t t i s t wrote:
It's not solo, since he's not acting as PIC, solo or
otherwise. No license is required for taxiing without the
intent to commit aviation. It may not be covered by
insurance, however, which is probably why it's not commonly
done.

Well you are splitting some very fine hairs Todd. I'm not
sure your argument (or the FARs you quoted) would withstand
the situation of someone taxiing around a controlled airport
where you need a clearance to taxi. It would seem to me that
you would have to be PIC in order to accept the clearance
and thus would be the "sole manipulator of the controls" etc.

I can't believe there was any intent by FAA to make it entirely
permissable for any unlicensed person to be taxiing around
airports with impugnity.