EDIT: As of FogBugz 8.8, you can add release notes at any time.
Many times I create a case, and at that time, I already have the release notes in mind. In our last process using StarTeam, we had a custom field for the release notes and I almost always added what I wanted the release note to say when I created the case. I typically only use the release note text and not the case description, so I can create something like "The system now supports X" when I have a case that is "Implement X". It would be beneficial to me to have the release notes link visible at ALL times and not just when an item has been resolved.