+support because it would be fun to see what is happening around you. I always wanted to be able to see what happens after I get shot as a cop and S.W.A.T. comes. But my idea about it is that the screen could black out faster and sound would remain for longer. The problem is that it could be abused by metagaming... unless it's realistic enough to say you can remember everything you've heard and seen during that time.
Instead of saying someone is unconscious, he could be just shot/hit so badly he isn't able to move at all.
But then when someone is shot in the head, he shouldn't be able to hear or see anything.
Just a fun feature.