In user story maps, I want to be able to add are release, and then be able to drag it up and down to change its sequence
Thanks for the idea!
Releases on your user story map are now ordered by release date, consistent with other areas in Aha! Note that parking lot releases are added in the order they are displayed on your features board.
For this reason, we are unlikely to add the ability to manually change the order of your releases at this time. We hope you can understand.