Gamepads incorrectly map triggers/shoulders on AppleTV

The shoulder buttons and triggers on AppleTV gamepads aren’t mapping to the correct inputs on AppleTV. Where/how can I fix this in the engine code? (I have looked – I can’t find it).

I’ve got an answerhub post here that has more details on the problem I’m seeing.

I’m pretty surprised that something as basic as gamepad mapping isn’t yet working correctly in UE 4.12.4.