We don't want to include the summary in release notes and don't want to add a custom field for release notes (unless there is some way to automatically populate it with SVN check in comments via Fisheye). The developers love using smart commits. They will not be happy to have to reenter their checkin comments and/or be forced to resolve issues using JIRA only.
I have read the documentation on creating custom release notes templates, but didn't see anything related to this.