I should have read:
Things that do not work on Gingerbread roms:
Search shortcuts in launcher
Music StageUI widget
Sorry, shame on me, ... but i can confirm that everything else is just fine. Wow, I didn't know i liked that stageUI so much.
EDIT: Okay, it totally works with the stock 351 musik apk from the OP. And damn, i like it today. This is a rooted, custom romed, stockish-looking streak. How cool is that? Let me have a look if i already klicked the THANKS-Button...
Next edit: Okay, now i have to admit i was a bit too enthusiastic. Next problem is i cannot open Emails from the Email Widget, guess im gonna read the thread from the beginning now...