Please excuse me if the following question doesnt make sense.

Is it possible to setup PA so that mediaplayer/mplayer streams audio via head-phone jack, but the Phone app sends audio out over bluetooth.

The usecase is for an N900 connected to a Sat Nav (like TomTom) via bluetooth.With the above scenario all the phone calls will be routed to the SatNav, however all the music will be played through 3.5mm jack connected to the car stereo.