For the correct settings : Controls «Mouse sensitivity» - 1.0, Options «Field of view» / FOV - 75 FOV 75 - Sensetivity 1.0 FOV 80 - Sensetivity 0.94 FOV 85 - Sensetivity 0.88 FOV 90 - Sensetivity 0.82 Crouch for semi/automatic and m249 Command console F1 - «input.sensitivity 0.8»
Download the program (Download) and go to the macro editor
press the button «Open file»
and select the downloaded file
assign a macro to a key and run the program