I know, not exactly "high end", but sometimes I just want to boost bass or treble a bit, without fiddling with the EQ, which requires me to pull of the road and spend five minutes figuring it out (note to EQ UI people: you're fired! :) ).

There's "Loudness", which I consider useless. It would be nice if it were replaced with "Bass" and "Treble" in the same menu. Direct remote control of the two functions would be nice too!