Has anyone been able to find a potential workaround for this? I'm in the same boat as OP, where I've grown accustomed to using the same ADS sensitivity for all scope zooms to achieve a consistent amount of input required for a 360 degree rotation.
I've tried setting the config file to read-only and changing the folder to read-only, but it seems like the game outright refuses to allow a "High Zoom" ADS sensitivity above 2.00.
While I understand some may point to the impracticality of having the same sensitivity for long range scopes and short-range reflex sights, having a consistent 360 sensitivity makes it possible to use sniper scopes and ACOG scopes in a pinch in CQC situations, instead of forcing the player to rely on inaccurate hipfire. After playing Insurgency Sandstorm with this setting, it has actually become quite difficult for me to use any scopes in COD MW.