Request: Hotkey support to mute/unmute each stream

[LuCKySoZ]

The purpose would be to "bring forward" a narration/commenting of a good moment in an specify stream. Not gonna lie, I'm asking this strictly because of DotA 2 TI multi stream. My suggestion would be the numbers, not the numpad ones.

[zipus]

Seams possible with setVolume(volumelevel:Float):void if the streams are embedded with JS (which is not for now).
And with video.volume=1/0 we will need to search for the video element inside the iframe which is not possible due to cross-origin policies.