Sorry folks, I was away for two weeks and couldn't reach the forum meanwhile. I wrote the little patch to save the binning value for guiding.
The idea was to handle the "guider binning"  independently from the "indi control panel" parameters if - and only if - the camera has a guider head! This way - I thought - it is possible to use the camera either directly as an imaging camera with the "native" binning (set in "indi control panel") or as the "guiding" camera with the binning settings in "ekos guider tab". In the case of the presence of a "guider head" this value is corresponding to the binning value set in the "guider head" tab of the "indi control pannel".
So what happened to Kevin is exactly that: Because the "simulator camera" has a "guider head" the value of the binning set in there overwrote the binning in the ""ekos guider tab". Of course the flaw of the patch was, that it didn't reset the value to the guider head value immediately. In addition there wasn't (and still isn't!) any information about this feature.
IMHO the question is now the following: Should the feature of a "guider head" be preserved or should it be abandoned?
I'm looking forward to hear your views.

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