I have a professional app that allow user to create a virtual desktop on whatever thematic. Inside you can bookmark all the file, page, folder related to that thematic. I find that very pratical.
It would be great that Goodnotes develops this. For example we could create a desktop for "Gardening" where I could link all the documents already in Goodnotes, relating to gardening, it could be a whole file, a folder, a bookmark.
Then I could create a desktop, "Current homework" with all my current work, like a temporary desktop.
It's very interesting because you don't have anymore to search in all your favorites or your documents tree to find each time all the file.
It will look like your real desktop table when you are working with all the books open at the correct page !!

Hope you will find the idea interesting :-)