I feel like mb needs some overhaul or enhacement in the albumart section.
When you open the editbox for an album or track and you want to search for albumart, you have to right click the square and select search internet. It would certainly be better and easier to just have a simple searchbutton below the albumart (and a button for opening a folder to select locally). Also if there is multiple versions of an album cover one has to do it all over again in the artwork tab, multiple times, whereas an option to save them all at the same time would be preferable instead.
Sometimes it takes several minutes to just to search and select multiple covers for a single album. Gven that I have (and probably many more mb-users) have very much music and files to edit, tag, move or whatever, I feel like this would be a very nice enhancement and a timesaver.