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Starting again - perhaps I pitched my comments a bit low. It sounds like you know what your about.
If speed control is the only consideration then microprocessors might just be personal preference.
Most, if not all tangent arm builders will use a DSLR or similar, and staggering shots by turning the drive off for a few seconds between images, a sort of dithering, is very beneficial with significant gains in image quality.
Using the microprocessor as an intervalometer can be a nice way of automating the whole thing, along with the short delays between images. A neat level of sophistication.
Not being an electronics expert a microprocessor was the simplest route. A ULN2008 makes a simple interface for unipolar motors and an L298 for bipolars, with some flyback protection if necessary.
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