To mconsidine:
I used the setting to store the sub frames for own postprocessing (called "Save each fram in enhancing"). Exposure time was default 10s. I ran compass calibration before the session and adjusted the level to 0.2°.
To starnet:
I know that some frames end up discarded e.g. if the stacking fails but as mentioned there are periods where only one out of six frames get stored. I initially thought that our local Bortle7 sky condition contributed but last weekend the same happeed under a Bortle3 sky.
Yes, an option to bluntly store all frames would be super useful from my point of view. This way I can decide later on by myself which frames to throw away and which not. I agree, this SW change should be quite simple.