It would be useful to have a preference like the default stereo mode for how audio is dealt with when you have a stereo session. It happens far too often that we launch mono movies where the user's initial audio settings are high, and when they launch a stereo session audio is blown out completely and painful. With a setting like for the stereo mode, you could pick: get audio from left, right, or both. That way the initial settings would be stabilized for whatever you play.
thanks
JRAB