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I did think of this method too Al, when I started imaging on the dob mount.
My problem was that I am almost certain I would not get the RA axis facing the right way, and even then it would still need some minor, if not major adjustments to keep it on track.
The other problem, is that up on my EQ mount, my finderscope ends up 2+ metres off the ground so I'd need to be standing on something, which isn't very helpful when it's going to swing all the way across the sky.
The dob mount is convenient for me and usually I hug my arms around the OTA to swing it smoothly, though I could work on the alt/az motion to get it smoother.
What I really want to do (and plan to do) is use a spare 6x30 finder I bought, with my old ToUcam, and have a wider-field view of the ISS so I can track using the computer screen rather than the finderscope. It'll be way more accurate.
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