Well.. i opened a topic on the official forums and it got a total of 0 replies, while the one talking about skins and keys is full of people........
Is there something we can do via ini? i mean.. ue4 has the scale axis x/y command already built in if i remember correctly from unreal tournament but i didn't mess with it.
It should be something like this
AxisConfig=(AxisKeyName="MouseX",AxisProperties=(DeadZone=0.000000,Sensitivity=0.002472,Exponent=1.000000,bInvert=False))
AxisConfig=(AxisKeyName="MouseY",AxisProperties=(DeadZone=0.000000,Sensitivity=0.002472,Exponent=1.000000,bInvert=False))
but it's not working with different sensitivity or exponent values in gameusersettings.
I'm not at my pc atm, someone can try adding it to input.ini with different values and forcing it to load via launch options with -INPUTINI=input.ini to see if it still works.
edit: doesn't work.