You should be able to get it working in Windows 7 SkippyBing. I found a few mins today to try out SF2V on an ATI Radeon HD 5870 connected to two 30in monitors.
Nothing worked in extended desktop, but when grouped together SF2 did render across both monitors at 5,120 x 1600
Unfortunately, rather than adding more viewspace either side of the cockpit the game by default simply stretched the image horizontally, so that for example all the dials were ovals instead of circles.
I did manage to minimise this distortion by manually editing options.ini and increasing the aspect ratio, but even then the view was only a tiny bit wider than on a single monitor (I could see approx 1in more cockpit spars on either side)...
I'm at a bit of loss to explain why there wasn't significantly more viewable area, but I guess its because despite having an adjustable aspect ratio, SF2 has a fixed FOV.
I'm still keen to try it on a triple-monitor setup though :)