I don't recall anybody investigating this to any further detail -- probably because too long exposures with "non-modded" CCD are pretty useless anyway. What stops you from taking several consecutive exposures, say 60 s each, and then summing them up?
BTW, I have a suggestion for the developers: can there be an option to do the dark frame on demand, rather than right after the shot?
answering the post again, I found the trick without cutting wires or adding extra scripts to CHDK, Im' sorry for the annoyance of the topic spanning in different new threads on the forums.
Started by steveg
Started by ewavr
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General Discussion and Assistance
Started by fudgey
Hotwire! Hardware Mods, Accessories and Insights
Started by shaltzman
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Creative Uses of CHDK
Started by Byte