One way to do it there's an option for it in option/view, look function=steer and below there, there's a slider you can change the amount of the head's turning. The second way is (like i did in that) choose the 'ms X' and do it manually by the mouse, did it since the "default" steer setting only follows your hand's movements (ingame) and can't focus other way than the way you are steering.
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