It would be cool if there is a solution pen that is only displayed when you switch to a solution mode, because for example you have a whole list full of sentences that you have to learn the answer to, and so you can just query it yourself, (the flashcards are handy, but with whole pages full of questions it gets too much). Example. You write down the questions with the normal pen, and then switch to the answer pen, with which you write down the answer.

I would also like to be able to synchronize certain OneNote pages with GoodNotes, because my teachers mostly work on OneNote, so I don't have to manually add all the PDFs or images to GoodNote, and when I have to export the GoodNotes document at the end of the lesson and paste it into OneNote for my teacher to view.

Likewise, I would find it good to be able to start a synchronization directly with the key combination "⌘ command + s", for example, because I sometimes insert a picture from the MacBook that should be directly on the iPad so that I can annotate and edit it.

Another idea that I would like is to be able to write text on a post-it that stays on the post-it even if you move the post-it, and if you select a post-it and move it, you don't move the text under the post-it as well.

Since I use the program Notion a lot, a connection to it would also be very handy, where you can display certain GoodNotes pages automatically as a PDF or as an image, e.g. for a formula sheet or a drawing, and when you expand or modify it you don't have to export the page again and paste it on Notion.