Very interesting thread.
Just wanted to add, that for drizzle algorithm to work dithering may not be needed with less than perfect guiding, as there will be some variations between the sub frames anyway.
Also, although it does not relate to sensitivity, but it might be useful to be aware of the fact that binning will also increase well depth given that camera allows to adjust gain. It can come in handy when using a CCD with small pixels and thus shallow well depths.
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