Spot on FH1100,
This happens thousands of times every day in the utility industry us. In the utility world. These ships are operated for 8+/- hours a day and typically only have two starts a day (sometimes they shut down for lunch). They typically fuel 5-10 times each day and get out for a bio break on about half of those fuel stops. multiply that 3-4 times each day by about 1000 aircraft and you will see it happens all of the time.
Many pointed out some good tips.
Typically, in the utility industry you are in a field with no other persons around. Typically the pilot never gets more than 10m away form the aircraft.
Ground Idle, Frictions on.
Wheeled aircraft?! not used in the utility industry.
I would never do it in high winds, or on a uneven or slippery surface.
Sure there is risk to it, but certainly not anymore than pulling pitch on any given day.