Try to modify how looks like your categories - change it, remove there thumbnail viewing, leave only names (what you wish tio be shown in your playlist-like category) and make your own template for view categories.
It will looks like playlist, but will not the same as playsit we know - for listen youl need to open detail, by clicking on name of song or something. If you add here MOD "open image in new window" or something like that, maybe you'll get what you want.
See V@ano's post about how to remove thumbnails:
http://www.4homepages.de/forum/index.php?topic=23737.0
