Offline support without third-party app

At the moment the only way to access "khan academy" content offline is by using "kolibri" app. I would prefer to store "khan academy" content in a tree-like directory. That is possible to do manually (or with a script program) using a video downloader but storing exercises is a hassle. As far as I know, saving exercises with answers is not possible like downloading a video.

I believe it would be great to add:
*an option to automatic downloading for a specific course or course's sub-subject.
*an option to download exercise's sections in a single file (e.g. pdf).
*an option to download quizzes sections in a single file (e.g. pdf).

Example:
Result of downloaded course "Calculus 1":

~/Calculus1/"Limits and continuity"/"Limits Intro"/<video1>
~/Calculus1/"Limits and continuity"/"Limits Intro"/<exercises1>
~/Calculus1/"Limits and continuity"/"Estimating limits from graphs"/<video1>
~/Calculus1/"Limits and continuity"/<quiz1>
~/Calculus1/"Derivatives: definition and basic rules"/"Average vs. instantaneous rate of change"/<video1>
~/Calculus1/"Derivatives: definition and basic rules"/"Average vs. instantaneous rate of change"/<video2>
~/Calculus1/"Derivatives: definition and basic rules"/"Average vs. instantaneous rate of change"/<exercises2>
...

Where
*<video{num}> is the video of lesson's page, of which format would be good to be selected "best/worst".
*<exercise{num}> is a single file with four exercise like it is at lesson's page.
*<quiz{num}> is a single file with the quiz of a subject.