Currently, you can shuttle in a movie (i.e. your timeline) on your Monitor window, but you can not shuttle in the preview window (as far as I can see!) This would be very helpful in fine tuning your in's and out's. Right now, the best you can do is either fast forward or reverse at regular or high speed, advance frame by frame, or, by using the slider scrub over your clip at any rate, but you get choppy digital audio, as opposed to the smooth "slow motion" scrubbing you get by using the shuttle bar on the Monitor window.
Please let's lobby Adobe to add this feature!