you still have the issue of no developer resources to do it
But I think (I could be wrong) that an overlay can be done without the game developer consent, I mean, they could just create an overlay notifier that worked "over" any game.
Of course, I`m no coder but I think that is possible and I think it would be the next best feature for Winamp
Of course, I may be wrong, but if it worked, in this day and age it would be perfect for winamp and it would set it apart from other players.
Oh well, I can dream right?