[da-anda]

don't forget about music videos, so it's not paplayer only. I'd say, if one enables stereo upmix, do it for every non-passthrou stereo source (JM style) and don't add unnecessary complexity to it. If really demanded by many we can still make it depending on source or add it once we have a DSP/EQ and make it more intelligent (e.g. for TV only move sound available in left and right to center and not just everything).