I've not been using the 'auto-calculate album rating' feature myself, but in doing some testing today, I got convinced that the option 'exclude zero rated tracks' had a bug, since it didn't make any difference toggling it on or off.
But I found out it only functions on tracks that have been manually set to 'no stars'
Personally I was expecting it to function on 'not rated' tracks also.
Am I wrong to think it would be better to include 'not rated' for this option?