Questions
How to use gyro aim on a Mac
The DualSense, DualShock 4, Switch Pro Controller, and Joy-Cons all have a gyroscope, and macOS reads it. Almost no Mac game uses it. InputConfig turns tilt into mouse movement, so gyro aim works in any game that takes a mouse, which is every shooter on the Mac.
Setting it up
Pick the Gyro Aim preset or add a motion row to any preset: the gyroscope's yaw and pitch become mouse X and Y, usually only while a trigger is held so the camera does not wander between fights. Calibrate once with the controller at rest, and re-zero from a button on the pad whenever it drifts; the gyro page has the settings, including sensitivity, a deadzone for hand tremor, and which axis to use.
What feels right
Low sensitivity and a hold-to-aim trigger is where most people land: the stick does the big turns and the gyro does the last few degrees. Turn it up only after a session. A deadzone of a degree or two stops a resting hand from jittering the crosshair.
The same sensor as a cursor
The Motion Cursor preset uses the gyroscope to move the pointer instead, waving the controller like a remote, which is a different thing and a real accessibility option for someone who can hold a pad but not work a stick.
Questions
Which controllers support gyro on a Mac?
DualSense, DualSense Edge, DualShock 4, Switch Pro Controller, and Joy-Cons. Xbox controllers have no gyroscope.
Does gyro aim work in Steam games on Mac?
With InputConfig, in any game that takes a mouse, Steam or not. Steam Input's own gyro support on Mac is patchy.