I would also like more control over the search box on the Vista/7 start menu, like how LONG or TALL it is. And how far the "all programs list" is from each edge of the start menu (atm it is linked to how far the the mouseover item is)
I'd like to specify my own image for the shadows on pop up menus and the start menu and I'd like to be able to have huge shadows like on Mac OS X.
An OPTION to have a Fading start button and titlebar buttons (on perpixel frames)
Start menu launch animation (I always thought the start menu just appearing was a bit boring, although I'm a little unsure how much control I'd like to have)
Be able to customize the user icon frame in Vista and 7 (I'm probably not the only one who would like this feature), the default one just doesn't go with a lot of skins. I don't like the way on XP WindowBlinds always cuts the edges off the user icon that aren't on the "Top Part" image of the start menu.
I like the new UIS0 skins but I always liked putting my OWN images in, and UIS1 and 2 don't skin aero very well, I thought maybe you could have seperate images for stretched borders and just use the "Glass" borders for fully glass windows (like the gadget gallery) and aero peek windows.
When I apply the skin the colour the DWM adds to tramslucent windows is always set to the dialog background colour (which is grey for a lot of skins I use), I'd like to be able to set my own colour, maybe even a feature to pick the colour currently being used. For some reason if I change the colour AFTER I apply a skin it always resets to the grey when Explorer restarts, I lock my computer, resize or move my taskbar.
Perfect Mac OS X scrollbars - I did notice the "Sabretooth skin" I love the scrollbars, but I'd like to also be able to have the extended arrow buttons.