While this is definitely a workaround, I thought I might suggest something. The fields seem to be type sensitive on iTunes 12.
So, Album, Album Artist, and some others are available for Music/Music Videos. So, if you have your tracks as something other than these, it won't show up. However, iTunes 12 doesn't delete fields, so you could change the type to Music Video and then put info into those fields, then change the type back to whatever you had them as in the first place.
I did this while importing some TV Seasons. The strange thing is that iTunes still lists Album on the unwatched list for TV Seasons. So, for those that are imported, it says unknown album. It's bad enough that Apple took away some useful fields from some types in the standard Get Info window, and then didn't even allow you to add them back again if you wanted, but they actually use these fields in some views and it messes those views up.
Hope this helps.