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I often run into modeling situations where I need to file part of a model in a crevice or recess a normal file can't get to and even a curved rifler is not an ideal solution for. I always seem to want some sort of small, ball-tipped file I can stick in the crevice and spin. Something like this:
http://polymerclayexpress.com/images2/balltipset.jpg
but straight and with a file tip instead a smooth tip. Anyone know if such a thing exists?

Some dremel-type tools have ball-headed abrasive bits - they might work, possibly in a dremel running at very low speed?