We too would be interested in such a feature.
We regularly sent customer notifications, emails, sms, at present we have to have them hit a page wait for another email/sms which we can’t customise to the speicifc scenario.
The current customisation tools are lacking for an enterprise product. No ability to handle different contexts in which login is being requested, the email templates themselves have no version control.
Being able to generate a time-limited, single use token that can be used to authenticate someone, similar to how an updated access token is obtained via a refresh token would be a massive improvement to the UX of our product. We could do away with the limited built in auth0 approach and provide a seemless experience for our customers.