Feature request: Crowdsourced timestamps and subtitles

[Tortoc]

Today i was watching some talks because of boring and Corona ( :c ) and found a talk where i wanted to skip through faster and thought it would be nice to have some timestamps in the videos. Timestamps for the questions at the End (where the question asked is a timestamp - because you can't see them in the preview) would be really nice.
In my opinion subtitles would be also a massive improvement. Maybe include some additional commentary from the speaker?

Maybe a kind of gamified backend UI with points and rewards to crowdsource it would be a thing.