Seekbar hack?

Hi everyone!

I am creating a course for a client and they would like to prevent the student from being able to skip ahead on the content and go straight to the quizzes. I've so far removed the "next" button from all slides, however the client has pointed out that a student could still use the seekbar to skip right to the end of each slide. They do want to keep the seekbar, and keeping the seekbar is a priority over preventing the student from skipping (mainly because the pause button won't appear unless the seekbar appears). 

Is anyone aware of a "hack" that can sort of make the actual seekbar unresponsive to achieve the above result?

Thanks heaps in advance! :)