Hi all !
I'm sharing this tips because it's mandatory for me since I discovered it.
When you're using a gamepad, you can increase the camera sensitivity !

1) Go to the installation folder of the game (for me it's "C:\GOG Games\Mad Max")
2) Make a copy/save of "settings.ini" (just in case !)
3) In "settings.ini", adjust SensitivityPitch & SensitivityYaw to values that please you.
For me it's :
SensitivityPitch=55
SensitivityYaw=65
4) Save the file and launch the game :)

Hope this will help other people !