I'm not sure if it will really do you any good, though...
I think that SFC can only be displayed at an aspect ratio of 4:3, so spreading it across two monitors won't really work without cutting off the top and the bottom of the display... What might work would be to split the game to two seperate virtal displays, so that you could have just the map on one monitor, and the map along with all the control panels on the other... that is, if you have a hardware zoom feature on the individual virtual displays... Not sure if that's so.
I'm pretty much of an ATI fanboy, since I work with video, so my only real experience with the Nvidia stuff is from working on the next-door-neighbor's machine. Cul-de-sac PC Repair, at your service! ;^)
Chaos