My issue is with the automatically generated CD-case thumbnails for folders that have a folder.jpg or similar available. As the image shows, there is a grey haze over it and generally I don't like looking at CD cases when the contents of the folders were bought online, are DVD or vinyl rips. My suggestion is to add a new setting to make the thumbnails behave like the example on the right: just the image without messing with it.
Changing the setting cd_thumb_coverart_file
to be empty or a name that doesn't exist in the folder doesn't do anything, sadly. I expected this setting to only use the specified file and maybe only default to something when it's empty.