I've added drag and drop and additional image save formats in
version 0.2.1. Dragging and dropping the album cover to an Explorer window will save the album cover as folder.jpg.
Myrkul, I haven't forgotten your request. It's a bit more work than drag and drop but I will definitely add your request as well.
I'm going to be busy for a little while so I don't think there will be any new versions for the next few weeks.