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You would need longer exposures with the higher read noise with the gain set to 0. At 100 you get pretty much the same dynamic range as at 0. It's like an electronic switch in the camera - at 100 it drops the read noise and basically resets the DR. The one thing it does affect is the full well capacity, that point where a pixel has collected as much data as it can & starts to "bleed" into adjoining pixels. But that is compensated for by much shorter exposure times - less time to reach the full well level.
Martin is much more experienced than me, so you might want to try what he suggests first. I haven't really tried 0 gain, so I can't say if it does work well enough - I'm happy to be able to take the shorter exposures to get the same data resulting in more data in the same time frame.
Cheers
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