This has been mentioned previously and some changes were made - and those are great!
However, I think it would be great if you could implement something more like MarginNotes (https://www.marginnote.com/) into your program. At the moment (and as previously discussed, http://support.readcube.com/support/discussions/topics/30000000895) you can only view one note at a time. It would be ideal if instead of having sticky notes throughout the paper, there was a side panel that instead showed the comments you have made (like the review panel in Microsoft Word, for example).
Thank you for your time!