It would be great if there were the ability to have multiple ratings for a single song. In my example, my wife may absolutely love a song that makes my ears bleed (I'm sure at times she feels the same). I would like a way that when the song is reviewed by myself on my login it shows as a bomb and when my wife logs in that it shows as a star rating.
The issues I see are:
When syncing to devices (add a choice of user associated to device?)
Syncing ratings back from device (android, iphone, etc...) when the ratings sync back (I hope this a VERY real future feature for Android), how do you ensure the rating is only updated for the individual based on device (same as above perhaps?)