I want to have a release with multiple phases and milestones without a single "release date", so I would like to be able to remove that and by default that release is on the top of other releases.
Thank you for your idea. It is currently possible to add multiple phases and milestones to a release. If you would like to have this release always show up at the top of the gantt chart, one work around would be to make the release date earlier than the other releases. You can have phases and milestones that extend past the release date, so you could still lay those out as needed.
Given the option above and the fact that release date is a required field for releases, we are unlikely to implement this idea at this time. We hope you can understand.