Would be extremely great if there will be an ability to create link to a part of the note (or to the whole note) and then use it in different notes.
For example, you can unite all your different notes and books in one note (that you can use as a central note). Or have one central note with links to notes by themes, f.e. "Programming", and in this note, will be links to connected notes, analyzed books, sources, etc.
This way you can creatively organize your workflow and connect your notes.