Something similar is in place in the game Guild Wars. I believe hitting the X key by default switches your view as if you were standing in front of yourself, looking at yourself and what's behind you, for as long as the key was depressed. You could be autorunning away from bad guys, press X and see what was behind you. You could even maneuver your character around while looking behind if you got the hang of reversing the movement keys. The view was equidistant to how far you had the camera in third person. I really liked this feature, and it made checking the status on things chasing you a breeze.
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