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I've found that for my STF-8300M, matched dark frames works better than scaled dark frames (judged visually with extreme stretching).
There was something funny going on with the bias frames - the SBIG engineers said they fixed a bug in the firmware when I reported it wasn't working properly. Might be something to do with the overscan pixels that RickS found/discussed a while back.
I'd assume that scaling for reasonably close exposures (i.e. scaling a 30 min dark down to a 25 min exposure) would work well, but extreme scaling (e.g. 30 min darks for a 1 min exposure) wouldn't be as effective since the ADU counts might saturate or go into the non-linear zones for some pixels.
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