Customize Subject on Emailed Batch Reports

All emailed reports are delivered with a subject of "OpenNMS Report". I'd like to customize the subject of the emailed reports to help identify which one I want to open. When scheduling a report I can assign it an identifier. This identifier is used as the Title of a report when viewed inside the OpenNMS Web UI. I'd like to be able to use this identifier as the Subject for emailed reports, or have another way for customizing the subject.