Hi,
I'm using the Dynamic Playlist in Amarok a lot, and I love it. I've got only a small suggestion for the UI of that. I have 4 Biases to get the music I want in my list right now, so it presents itself as a scrollable list. And sometimes I want to scroll this list down or I accidentally touch the scroll wheel on my mouse. But if my mouse pointer is over one of those ComboBoxes it changes the values of those instead of scrolling the list down.

The suggestion is now to give an option to lock these fields that you can't change the values of all those fields by accident. Maybe like you did for Amarok 2.2 where you gave the user in the option menu to lock/unlock the whole UI layout (which is btw. great).