It would be great if you could allow ticket to be added to releases that have already been released. This is usually just because of a missed item or something. Rather than just removing the release version and have it sit in the backlog in Aha! forever, I delete the ticket in Aha! currently.
It would be great if I could just pop it where it belongs after the fact.
This is possible today. You can "Unship" the release to add information, and then change the status back to "Shipped" to add the additional information.