Regarding canola-conf we are looking forward a new daemon aiming to decrease this cpu cycles that you talked about, but it's important to keep in mind that it's very hard to scan for medias very fast (this problem is not solved even on the desktop). So it will take a while to scan media but you can be sure that it'll be fast enough ;-) .

You'll also be able to play all your videos because the new Canola Media Engine (Atabake) uses mplayer to play movies, so video experience will increase a lot (playing videos locally and remotely also).

About a2dp, we'll support it as well. =D