More accurate motion blur?

The default motion blur uses the same pixel weights to blur the samples, which cause an inaccurate smeary look. Normally overexposed areas in photos like direct light sources stay lit in all samples like the photo below. Is there a way to use the HDR float values to overexpose the intensely lit pixels across the samples to give motionblur a more realistic feel?
Unreal seems to have done it properly, how can the same effect be achieved with Unity?