Hello,
I'm afraid not unless the manager changes the event creator over to be the user for that event.
Ideally it's best if you enforce users to register even if it's for a basic event.
Managed can accept etc for events manually if you don't allow the usergroup to have publish rights.
For QR Code, is this for tickets? IF so then this is part of the RSVP Pro template and you can decide to create a few default templates they can select?
Many thanks
Tony