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The stacking software will only remove field rotation if it has the capability of making streaks back into stellar points again... Field rotation, over long exposures, is not simply a shift of a stars' position in the frame, but it will physically 'smear' and trail the stars at the edges of the field.
Meade still do (I think!) a field derotator, which does work. Not cheap though... probably easier to spend $100 bucks or so on a second hand wedge, which will solve most of the issues.
Interestingly, due to the mechanical aspects, a lot of large observatory class telescopes are still on alt-az mounts, and use the field derotator method.
Regards,
Rob.
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