A good setup for Xbox Controller Users:
I made a controller setup which IMO works perfectly.
Here is the profile and accompanying keymapping screen:
The screen goes into the folder:
C:\Program Files\I-Novae Studios\Battlescape\Dev\Client\GUI\Screens
The controller profile into:
I recommend controller sensitivity of about 40 to 50%.
Invert Pitch set to on. Invert Roll set to off.
For "Keyboard Profile" select "x360".
For "Controller" select "Xinput Controller".