I think it’d be great to be able to move a Task between Projects, likely from the Task’s Edit page.
This can help with keeping things organized, as you may not realize you’ll need/want new Projects immediately, and it will save you having to either to export/import, or re-upload data (if you’ve not processed it).
For instance, I’d now like to move my Pix4D example datasets out from the Github Project, which initially was just a generic “Test” Project.