It may be 'norman behaviour' now, but a couple of years ago it worked actually great. I was able to control the full desktop OS with right joystick + R2/L2 for mouse move + clicks respectively, all while Steam was minimized in the background.
I tried both via USB and bluetooth. About the native joystick calibration I don't know what that means.
Is anybody able to move the desktop cursor with the joystick outside Steam or games?