#71, #68 and #17 implemented in RTCMultiConnection-v1.4

Mute only "remote" media streams:
connection.streams.mute({
—— audio: true,
—— video: true,
—— type: 'remote'
});

Mute all:
connection.streams.mute();

connection.mediaConstraints.mandatory = {
—— minWidth: 640,
—— maxWidth: 640,
—— minHeight: 480,
—— maxHeight: 480,
—— minFrameRate: 30
};

See #68 and #17 for further details.