Hi Steffen,
thanks. I already tried that, but did not gave what I wanted, seems that monitoring still does not get activated. I uploaded a short video plus two pics (where you can see how it looks like in my VST-preferences view and in the project and mix console-view .
In the video I had sucessfully activated auto-recording on before - and it works, but only for audio files, not for vst-instruments.
Found this thread, where Martin said that there is no way for auto-enabling monitor (maybe it depends on what version, here it is version 10)