I would hate having to have some dumbed down interface. By all mean have the ability to trigger an app that provides the same but just change the profile to another one with changed sound settings etcetras. Works fine for other phones and there are more important features for car integration.

Why not allow manual switching of profile for people without car kits but allow configuring of profile chnage upon conection to a car kit as opposed to a headset? This is one area that S60 performs very well in: might not be eye candy but very functional and as you said: who's lookng at the phone most of the time whilst driving?