Album Artist is not from Album Artist tag

[yardern]

First of all, a lot of thanks for this great application!

I have one question:
I modified several songs' Album & Album artist tags to "MyFavAlbum" & "A - C", they have different Artist names.
Songs do show up as in one album of "MyFavAlbum", but the album artist name is just random one from one of the songs' artist instead of "A - C".

Is this done intentionally? Or it is a bug?
Would it be possible to allow user to choose what to use in the options?

Thanks.