Sorry if this has already been suggested - had a quick search but couldn't find it if it has been.

One thing I would like to see is the ability to skin the desktop colours and background to the same as the start screen. So if I am using shuffle on a series of images for the start screen and using the "Automatically create a start screen color scheme...." option there is another option that allows the desktop background and colour scheme to be changed to match the start screen.