Hallo Onkel Enno,
I was looking for a way to easily access various important keywords I would like to use for tagging songs. I wrote about that here http://www.mediamonkey.com/forum/viewtopic.php?t=25324#139129
I think that, ideally, MM would provide an extra classification field with the usual functionality but without a special name like Mood, Occasion - just "Keywords". This way it would provide perfect integration into the UI.
But in your first post the screenshot shows that you are doing just that with your script!
I still think this would be a good addition to the official classification system, but the script is quite close to that, already! Thanks!