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For any real length of sub you will still need a good polar alignment, but as Rob wrote, once you have an autoguider you can use software to speed up the alignment process.
I was actually fiddling with this recently, I was never going to get an image on the night I was playing around and I wanted to see if a planetary camera (An old Celestron one) was sensitive enough to guide with (Fat chance) so I started playing around with the frame and focus mode in Backyard EOS on a star near the horizon, if you align the camera consistantly you can see which direction a star is drifting in Dec and use that to help tweak the alignment of the mount. Basically the same thing as people do in the likes of PHD but more manual.
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