@RBF You mean that you would like anyone to be able to apply to a course, but then be able to moderate who actually get access to the course or not? Open edX doesn’t currently have this feature built-in, but some courses implement a similar workflow by using external tools - you can have a separate registration form, for example on Google Forms or SurveyMonkey, and ask users to provide the email they use in Open edX. Then you can review the applications there, and use the invitations / batch enrollement feature to enroll the users you select.