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In-game and config file is the same, so just enter 2.2 in the sensitivity 1 field. Also make sure the resolution is correct.

Unlikely. All my mods are based on decompiled source code and I don't think such a thing is available for cod 2. Also I doubt an existing mod framework exists for cod2 which means I'd have to write my own hook etc. And I mean even if all this stuff was available... it's more than a decade old, not really worth the effort. I mean co-op PVE games are currently a pretty limited genre. PD2, KF2, and Verm 2 are pretty much the only ones. There's deep rock galactic and GTFO coming though.

It's arbitrary. The degrees don't matter, and with your method you will get different scaling depending on the shape of the monitor. With that logic, over hanging a cloth on either side of the monitor to reduce its width will require a new sensitivity. Use this applet. Change the FOV to visually see the change in magnification. Pretend it's a 180 degree frame just moving forward/back to have the desired angle of view within the monitor, since the monitor doesn't grow or shrink to change the amount you can see. As the frame moves forward/back, everything will scale by the change in magnification. You simply undo that scaling on the sensitivity, which is what 0% MDV/MDH achieves. It will scale the sensitivity by the change in magnification. 0% scales only by the change, so it will only work when dealing within that monitor. If you wanted to translate that sensitivity to a different monitor, you would have to take the focal length into consideration. Two different sized monitors could have the same angle of view, but require different sensitivities, as the physical scale will differ. The quantity of degrees on screen hardly matters. You just use them to calculate the change in magnification relative to that monitor. If you are wondering, if two different sized monitors both have the same angle of view, then you just need to scale the sensitivity by the difference in monitor size. The focal length is the radius for the image. 2pi * radius = circumference. Translating the sensitivity using 0% MDV/MDH will maintain the ratio between the image circumference and the sensitivity circumference. Any other method is just an arbitrary change in sensitivity. Here is a visualisation:

All games are analyzed with scripts etc, and the sensitivity is reverse-engineered. Except for a handful of games the sensitivity formula is 100% correct. The exceptions usually have some issues making accurate calculations impossible, but they are usually within 0.X% accurate. Extracting the sensitivity from the game files is probably possible for some games, but not really feasible as a method since there so many different engines and not possible for most of them. Games using the same engine usually share sensitivity or at least part of the formula, but there are a lot of exceptions where same engines use totally different formulas.