I don’t think so, as this is a simply adding to the db case.
You can just create a separate table called Waitlisted. Then create a form with an email field. Then a function that would add the input of the form to the table.
When the user submits the form they add themselves to your whitelisted table.
That’s basically what I thought of doing. I was just wondering if there was a system in-place for what’s next. Like a method to move someone from being waitlisted to being in beta, inviting them to signup through an email form and a link I guess.