Dualview gaming - Windows 7

Hey all. I'm running the system in my sig, and it's really too powerful for my tiny 17" 1280x1024 monitors. I'm running Microsoft Flight Simulator X Deluxe with every setting maxed out (even things like ground, ship traffic, visibility, etc) and it runs smoothly. I run 2 identical monitors, and want to run the game across both instead (would probably have to lower some settings, maybe). I've heard people talk about "dualview" but I can't find that anywhere. Is that the same as setting the 2 monitors to extend the desktop across both? (gives 2 full res monitors, not 1 virtual crazy wide monitor). When I do this, the game runs full screen on one monitor, and the other still shows the desktop.

I've tried switching to windowed mode, but if I drag a window larger than 1280px wide, the extra space is just black, not an image. Hitting maximize on one of the monitors, switches it to full screen in that monitor. I can't get it to go across both.

One thing that I noticed, is that in FSX, it says I have "GTS 250.0" and "GTS 250.1" as my available monitors. I've read that setting them to dualview, you should then see the massive wide (2560x1024) option available in the game, but I don't see either of these anywhere.

I'm running Windows 7 with the 185.85 64-bit drivers.

Can anyone help me out?

edit: a google search resulted this

Could this be my answer? why has nVidia disabled dualview on their new cards? There must be some reason behind it. Is this safe to do?

Upon even further reading, it seems that "dualview" is the same as the windows "extended". So than am I looking for "span"? Basically I just want my 2 monitors to act as 1.