Selecting individual pages is a feature i'm missing out dearly. Having large pdfs, it's really cumbersome to delete 30+ pages just to have a single page inserted

Goodnotes 4 used to allow you to multi select documents to import. Seems to me that Goodnotes 5 wants you to import one file at a time. At least it remembers the 'from' location!!

Have the option to add the imported document to the end of the notebook even while I have the notebook open.

I agree, would be better if GoodNotes can select which page to import

Sometimes the screenshot isn't adequate as a substitute to the suggested function since the resolution of the photo can be lowered during import.