It would be great to utilize the SIMILE Timeline project to give timelines for use in reporting and Project Management. For PM this could be a souped up Gantt Chart.

http://simile.mit.edu/timeline/ They already use JIRA for issue tracking so maybe they would be glad to help out

If JIRA had this it would be a much easier sell as a Project Management tool for people who insist on Gantt Charts (and many do).