Motion blur

[Sexbad]

I always liked how when your framerate lowered in Penumbra and the motion blur was turned on, the motion blur would get larger in the lower framerate and make it seem a bit more like a sort of horror effect. Sometimes I took Fraps videos just to lower my framerate and make the game look cooler in the scariest parts.
However, I don't really like a low framerate but I think it would be really awesome if you were to make a sort of thicker motion blur that would turn on in the case of a chase scene or other scary thing in Unknown in order to make the atmosphere more frantic. Would that be possible?