Woohoo, that’s it: somehow the config.xml didn’t make it into the .ipk-package.
After adding it manually from sources to the admin-root directory it (nearly) works as expected including the 6 Firebug errors 🙂
Unfortunately the config-page gets confused again when I switch on my favourite VariousArtists-Compilation-setting by adding the following code to my mt-daapd.conf:
concat compilations = 1
Maybe this setting can be honored by the config-page in an upcoming release.
Best wishes from Germany,