I have a request regarding the playlist layout. Perhaps you could change the window height to about 400 or 380pixel?
self.main_window.setAttribute(QtCore.Qt.WA_Maemo5StackedWindow )
Thats great. As far as I can see it works now here, too. Perhaps we should look later at the ui translation. At the Qt version more buttons are not transtated than at the GTK version. But this has no priority.