I am attempting to use displayfusion to dual-head World of Warcraft

i am wanting displayfusion to span the game across both of my screens, and use an ingame addon to restrict the game world to one screen, and put all my other "stuff" on the other

End result:
http://www.meetcweb.com/up/2011.04.18-11.50.49.pm-World%20of%20Warcraft.png

I found the "span" feature in the window manager, but either I am doing it wrong, or its just plain not working....also I am using Windows 8 with an nvidia video card so the deck is effectively stacked against me...however...i believe this can be done...suggestions?

ok, so it works if i put i am in windowed mode, however, not if I am in fullscreen windowed, which would be preferable, as windowed mode tends to slow my PC down, not to mention it distorts the gameworld XD i feel like all the characters are short and dumpy when they should be slim.....