1) Ability to completely hide the search bar (like Mozilla/Netscape's toolbars)
2) Ability to access the search bar regardless of what is selected - many times I know what I'm looking for is in a specific category, so ti would be easier to select the category than type out a complicated filter string. Look at Dapyx MP3 Explorer for a pretty smoov implementation.
3) Ability to get rid of song info area above the player controls
4) Ability to move the player controls to the top (under the text menus) so all my primary interface controls are near each other - a usability point.
5) Ability to display the Playing Now window above the Content Pane, the way the Visualization Window is displayed above Playing Now.
6) Assurance that visualizations are not eating CPU cycles even thou I do not have them visible
That is all