Include ability to right-click and copy an attachment to paste it somewhere else.
Include ability to right-click and copy or drag and drop the email address that is in the "To" or "CC" or "BCC" line into the body of the email.
Allow to right-click on a word (while Grammarly is in use) that is spelt wrong (or similar) to speed up the process to fix it (hover takes too long). Would be good if it could also auto-correct simple mistakes. "i" automatically changed to "I".