Hi Pete!
Scheduled video publishing is not really achievable for DTube because only YOU can control when something gets published (because blockchain / crypto / etc). So it would need to be done on your side. Maybe we can have a browser extension for that, but you'd still need to keep your PC on. So it's not really good right.
Unlisting videos can be done. Technically if you go to Edit and blank out everything, it should work. Also if you go on steemit and just remove the 'dtube' tag, it will also hide from DTube.