I use San's FOV changer. It's a bit buggy sometimes, but can't live without it anymore. The default "wide" FOV in IL-2 is only 90 degrees in width. With 30" monitor with the looking distance that I use it looks like you would have a serious case of tunnel vision.
With 120 degrees it looks much more plausible, although causes some distortion between what you see on the center of the screen and what you see on the edges. The FOV is ofcourse fully adjustable in the San's app, can be much as 180 I think
The buggy part being that when I switch to smaller FOV(the default "wide" for example) it sometimes gets stuck so that you cannot switch to the higher "San's FOV" anymore. Only pushing the restart button on the San's app seems to help in this. And somehow this is related to the OS you are using, as on W7 it seems to do it much more than it did on XP.
-Untamo