A comet's tail is actually composed of tiny particles or gases (blown off the
comet by the Solar wind, I think), so the tail effect isn't actually
motion-blur-from-movement (although it *looks* like that from a distance.) As
others mentioned, media might be a more appropriate way to create the tail;
perhaps media within a transparent cone object(?). Plus some turbulence.

However, your running-man example made me think of a 'solid media' idea,
something I posted years ago. It might be helpful, to get the effect you're
after. Take a look at the image example I posted there, a kind of step-by-step
guide...

http://news.povray.org/povray.binaries.images/message/%3Cweb.4436e54a72fe66658ad7a9060%40news.povray.org%3E/#%3Cweb.443

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