Thanks for the suggestion!
Do I understand correctly that you mean both notes list and note editor here?

Hi Vladimir,
Thanks for the suggestion!
Seems to me this is two different ideas:
1) Including notes into each other
2) Autogenerated table of contents
Is that correct?

Thanks for the suggestion!

Simply Alt+Shift+click on the parent tag

How about 2.8.6?

Released in 2.8.6

Thanks for your comment!