"BACK COVER IMAGE NAME" VARIABLE DOESN'T SAVE?
I don't know on what page this might actually display and I certainly don't use / cater for it. But I did notice that if I typed any value in there (on the APPEARANCE SETTINGS page) that this value doesn't appear to save and reverts back to "Back.jpg"
This is pretty much hardcoded. You only see the back cover if the click the album cover on the track listing anyway. I was going to use the back cover and have that CD case 3D rotating but i never got around to adding the code.