Here's a discussion about a workaround that might be helpful.
http://moodle.org/mod/forum/discuss.php?d=62201
To follow up on that discussion, most of our gifted students (ages 6 thru 17) never think to look below the bottom line of the top half of the main page of the course.
So, we have completely *revealed* topic sections of activities down in topics 8 or 10 through 20, and nobody ever thinks to scroll down there and just click on the activiity.
This will make more sense after your read the discussion
Teaching with Moodle
How Can I Have Prerequisites?
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