1) Tobii eye tracking - I would improve interaction greatly - extended field of view and flashlight tracking where we look, I would brain our minds in terms of immersion. Especially in Chernobyl. 2) No time limits or very little of them - when I read comments, I really would not like to do something on time. I play to relax. 3) Maybe some physX fluids? Don't know. 4) Possibility of having companions on some missions. And maybe a dog. Simple equipement for them (like changing their weapons and armor).
