Option for back/forward keys to go back/forward 10 seconds instead of in playlist

[yaomtc]

Currently, the back/forward keys go back and forward within the playlist. I don't see this as particularly useful for my use case. Instead, I would like an option - probably disabled by default - to make the media back and forward keys to instead do what the J and L keys do when the video is focused: go back/forward by 10 seconds within the video. I think this would be very helpful to people like me who seldom make use of Youtube playlists.

(Since installing this add-on, I have several times lost my position in the video due to accidental pressing of the media forward key instead of media play/pause. Adding this option would also help to prevent this sort of accident for clumsy folks like me.)

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