a way to Reorder photos, by Drag & Drop for example
there is no way to reorder photos, nor for in the gallery, nor by export.
I'm using DT to manage my huge library of scanned negatives; it can happen that an 'event' is spanned accross multiple rolls of films, which when scanned in the wrong order (it's difficult tu judge continuity of films by your eye; some films don't even have a image count and therefor strips are scanned in randomly) results in a collection of photos in wrong order; sorting by timestamp/whatever doesn't help here as the image data is generated by the scanner, not by camera.
It would be extremly helpful to have the ability in DT to sort your photos either by Drag&Drop (certainly the easiest usability) or by other ways, for example by providing an ability to assign a 'nuber' to each photo inside of a collection/roll and than be able to sort by it...perhaps other ways i'm not aware of.
I'm sure not only scanned photos would benefit from this feature.