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A rough number of darks would be 10 if your fussy, 5 would do. Average or mean combine is fine, youd be hard pressed to tell the difference.
I have used the same dark library on my SBIG for over a year. Again, it depends how fussy you are.
The Southern Astro site note means the longer exposure bin 1 darks are typically used for Lum-Ha, and shorter bin 2 darks for RGB. For the act of taking darks, as you say, filters are irrelavent.
Brads app is great for totally automated capture and processing on a large number of darks on an automated rig. DL itself can provide one click automated processing with a whole folder of bias/dark/flat subs, and spits out all the masters in one go.
It will even scale different temps (if the cam inserts temp in the FITs header, NOT DSLRs tho).
For a DSLR, from the results ive seen, ICNR is the most effective for most users, given the lack of temp control.
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