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Hi Fred/Jase,
CCDStack does a sigma reject on your stack, then sums the pixels left over, it's fine to do a sum if you've already rejected the outliers. I have used all three combines (Median, mean and sum) using the same data and really you'd be hard pressed to see the difference. For large data sets that have had the outliers removed mean and median are really the same, so use mean, it makes sense mathematically. Sum and mean give you different pixel values, but relatively they should be the same for a large data set, sum may allow for slightly different histogram manipulation.
Cheers
Stuart
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