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Now that is very interesting information Gilles. Our sensor is 3008 × 2000 pixels and we are using "only" 3000 x 2000 pixels so there would be 8 unused pixels in each row. This could potentially be used to evaluate the accumulated charge but would require modifications to firmware and drivers.
But is this approach really useful for astro-imaging considering that our image consists of areas of extreme contrast (stars vs background). For example, if there are no stars in the hidden pixels the evaluated accumulated charge would be zero there... but there may be very bright areas in the rest of the images from star light.
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