I have noticed, in the skinning area of the admin control panel, you can add images to Title background 1 & 2, etc. But you only give the ability to control image repeating and position for the main body background.

I think it would be really great if you could also give the image control capabilities that you give to the main body background form to the other forms that use images as well. Such as the main window 1 & 2 background. I find that it limits skinning creativity without that sort of control.