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I think the PI dcraw options are probably OK. Will dig a little deeper.
The next issue not mentioned in the original post is pixel rejection parameters for calibration frames. I mentioned elsewhere, that because DSLR RAW data is mangled, integration parameters should not vary between frame types - bias, darks and lights, perhaps...
However, I now think, that "no pixel rejection" is a better option, for bias and darks, though bias frames are 'more' linear than darks. What do others think?
Flats are a separate case in terms of combination, but I still wonder if pixel rejection is warranted.
Lights need a degree of pixel rejection because they have been subject to unfriendly light sources - satellites, visual observers green lasers (bless them) cosmic rays and so on.
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