I can do bloom rejection, standard sigma reject, reject hot/cold pixels and data reject.
If I try to calibrate or do any kind of normalization or background flattening, then PixInsight produces a horribly graining picture.
So it looks like you can do some basic math and rejection procedures in CCDStack but no calibration or scaling. It will not even let me do CCDIS star registration. I've tried it all and this is about it for CCDStack.
I still use it to inspect my subs and do the data rejection as per above. I wish I know how to eliminate blooms in PI......