Ah yes, without guiding you'd be limited to short exposures for sure, I missed that. I used to do all my imaging with sub 30 sec exposures when I used the ToUCam, which was very similar to your setup.
Some of the really bright deep sky objects can show great resolution with ultra short exposures. The Homunculus for example, which is extremely bright. I think I used something like 1/25th sec exposures for that one if I remember correctly. Planetary imaging indeed
