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I think that if you carefully drift align in the region of your target you might get away with no dec guiding. But, if you pick another target further away there will be drift in declination, but only in one direction. A better solution might be to only apply dec corrections in one direction if that option is available. Clearly corrections in an opposite direction would be due to random variations in seeing.
However, this is probably not entirely true given that all telescope systems flex to some degree. This is where software like T-Point can come to the rescue as long as the flex is predictable.
Another problem is that if you turn of declination corrections you probably cannot dither - at least automatically. Even guiding in one direction results in this problem.
Peter
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