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I never used dithering via BYE but now using the software APT (Astro Photography Tool) and PHD2 for guiding I reckon it results in 15 to 20 seconds added between subs while the dither is done and guiding settles again. APT may treat it differently to BYE, it monitors the guide star and when that is falling within a specified number of pixels of the target it assumes the dither is complete and moves on.
That sounds like BYE simply waits for a defined time to assume the dither is complete.
Darks you should not need to shoot every night if you have a good dark library built up at different iso settings and temperatures.
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