I am using Cubase 10, the latest version 1.10.4 of the VST plugin and BIB build 614

Problem 1
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When I click in the VST plugin on the play button I can hear music but I am not able to control the volume of the music in the Cubase mixer.
It seems that the plugin itself don't uses for playing the Cubase audio channels it uses his own output but there is no possiblity to control the volume in the plugin.

Why is the audio output not routed to Cubase?

Problem 2
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It is possible to drag&drop all created audio tracks at once from the VST plugin into the DAW.
Why is this not possible for the corresponding midi tracks, they have to be copied individually?
For them it should also be possible to drag&drop them at once from the VST plugin into the DAW.

Problem 3
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If I drag&drop all created audio tracks at once from the VST plugin into the DAW I got the question
if I want them all in one track in the DAW or if I want them in individual tracks.

This question is in my opinion not needed because
if I drag&drop all created audio tracks at once I want for sure to have them in individual tracks in the DAW
otherwise I would only drag&drop the master track from the VST plugin into the DAW.

It would be good to remove that question or if not possible at least having a checkbox in the options which I can tick which says "always create individual tracks in case of drag&drop all created audio tracks at once" .