If you're trying to export stuff per frame over a long sequence, then you want the calling code to control the frame step, not Maya's playback mechanism. I've authored tools that export a .obj per frame over a framerange for the selected mesh. In that case, you pass your min\max frame-range to pythons range function, and loop over those: Each loop you set Maya's frame to the given iteration, then do the export work you're after. If you're concerned about canceling the job in the middle of some super-long sequence, wrapper the whole thing in a progressWindow. I have an example of how to author a progressWindow context manager here: http://mayamel.tiddlyspot.com/#%5B%5BHow%20can%20I%20author%20a%20progressWindow%20context%20manager%3F%5D%5D I use this all the time, and sounds like even the example code could get you what you're after, since it iterates over a frame range.
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