I'm running version 4.3.0 of the start menu and LOVE the taskbar skinning feature. I thought it was about time it was added, and it's simply awesome to be able to make it a color different than your glass color, or even an image. Thanks for implementing it.
However, I just noticed that the taskbar skinning only works if you have it positioned at the bottom of your screen. If you move it to any other position, only the start button region and tray area have the skin. The rest uses the default taskbar design from your theme. I checked, it does this with both 3rd party and default aero themes. I even tried texturing the taskbar with an image while at the top, and only those two aforementioned areas have the image. Just wondered if you knew about this or if it's a limitation.