[hharney]

I do this is certain cases, primarily when I have landed and I taxi up to a tarmac while being directed by ramp personel. It is just a safety courtesy for the line crew as the aircraft is parked. I won't do it when I taxi out for take off, obvious reasons. Some considerations when doing this, the rear engine oil temp will rise faster than the front during prolonged ramp times. During long times on the ramp, especially while not moving, the rear engine may reach max oil temp before the front. In these cases I have shut down the rear. The first incident that comes to mind is departures at Oshkosh. Not sure your specific case but these pratices are fairly common for the Skymaster.