1. Comments in documents/attachments are labelled with numbers. These numbers are not displayed in the comments column. It would make orientation easier if the comments in the column had the same numbering as the buttons in the document (especially if several people are commenting on the same document).
  2. It would be great if individual letters could also be marked and commented on in PDF, as with Adobe Acrobat. This would make it easier to comment on text-rich documents.