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Doug,
Just my opinion, but, building dark libraries for DSLR images is a no go.
DSLR sensors aren't as "reliable" as dedicated cooled CCDs. In that they're a lot more susceptible to random artifacting and phenomena such as stuck, hot and/or cold pixels developing over time.
Up to you in the end, but, I'm a bit anal about this and would prefer to do my darks at the time of shooting (before, during and after and median combine the lot for a very close average of what your sensor experienced on that night).
No two nights are going to exhibit exactly the same conditions as far as climate/weather goes.
I guess it just depends on how accurate you want to be. Bear in mind, I know how much of a pain in the rear doing darks is.
H
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