VR Appropriate Effects

Motion Blur: Depends, again. You cannot blur the user's own motion, as this is not fast enough to be blurring things, unless looking from very close up. The motion blur's time window should basically be shorter than the frametime. (Eg, in car races, you could safely apply a motion blur that blurs the streets in the car's fast movement direction.) If you're rendering out directional motion in one of your render targets, and blurring by that value, this should work itself out as the car's movement is by itself considerably larger than the user's movement, and as such the user's movement won't have any noticable impact on your motion blur.