Okay, so I have 3 primary screens, and I have 1 tv connected above, probably one of the more extreme setups but nonetheless I run into a problem that prevents me from having 1 wallpaper across all my monitors. I have 3 24" monitors and then 1 32" tv on the top, all the multi monitor wallpapers only account for the 3 24" monitors and not the big tv. I'd like to be able to use the 1 wallpaper feature but I need the ability to unselect a monitor that the wallpaper doesn't apply to, and then just be able to specify a different option for the 32" tv.

Here's a pic so you have a clearer idea: http://i.imgur.com/7Vp2M.jpg

I would like to span 1 wallpaper across all the 3 bottom monitors and then have a single image wallpaper for the top one.