OK, so I think there's two way we can go about this:
1) Open lessons
When creating a new lesson, you don't have to specify each single user you want to participate in this sequence, which will mean that anyone that is part of the course you are adding this lesson to, should be able to jump into it.
This is regardless of whether they are in the course now or in the future.
2) Automatic sign up for existing lessons in course when enrolling
Upon enrolling a student in a course, we enrol him/her in all lessons.
Perhaps these two are not mutually exclusive though.
Your thoughts?
Posted by Ernie Ghiglione