Allow 'In Development' versions to be deleted or re-numbered
Sometimes you can end up with an extension where you have multiple versions under 'In Development', but ultimately you can only release one version.
Unlike the current active version, in-development versions aren't deprecated when a new version is released, so you can end up with old in-development versions that you can't do anything with (assuming you want to stick to some form of a convention for the version numbers).
It'd be great if the dashboard allowed you to delete/deprecate in-development versions, so you can clear out the extra versions, or allowed you to change the version number for in-development versions, so that these extra versions could be re-used while sticking to a numbering convention for releases.