Maybe this is too complex but I'll suggest it anyways...
It would be nice to support a custom HTML pop-up page that could be displayed for each album within MM.
This could be used to display info about the album, musicians, producer, historical info, jpegs, or whatever the user wanted to put in there.
The right-click context menu for an album could have a new item to invoke this page in a pop-up browser window.
I guess the database would only need the url for the HTML file on a per album basis? I'm no expert on MM architecture.
File could reside in MM album folders or elsewhere.
Failing that support for a simple pop-up text file per album?
Failing that a new "Info" tab on the properties pop-up with text box just like the "Lyrics" tab.
But HTML would be nice.