When I first saw the post title I was thinking of the characters themselves. After everything is ironed out, it would be great to have what you mentioned and some sort of reaction to the guy sitting next to you, or from an external view. Just a couple of simple things, like raising arms up in front of head when there is a close call or gun hit. We could think of a whole slew of things, but I think there are some simple ones to implement that could be used in multiple situations. This would all be an optional setting of course.
Maybe this is one of the many hidden features to be unlocked as hardware allows.
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