Right now, the admins can see that button, but cannot use it. They will see the same error message that users will get. Admins can only use the button if they allow this function for every user as well.
That's exactly what my patch fixes. As soon as it is merged into core admins will be allowed to start the process even if users aren't, which is what we (and Mark) require. If the patch helps you, could you express this by voting for this issue in tracker as well? That would help integrators to see that this is an important requirement for several people: https://tracker.moodle.org/browse/MDL-62544 (and, possibly, https://tracker.moodle.org/browse/MDL-61652).