It would be nice to be able to link any note directly to the document.
A short example: Lets say I have a note about one method that solve a problem. I have 5 exercices. 1, 2, and 4 involve this problem. A link between my note and these 3 exercices would ease navigation a lot. Hence, preparing exams, I would read the note and find all exercices I have practiced the method.
Hope this could be in the scope for future development.