Yeah, its a real shame, since it'd add to the effects you could do... and maybe settings to animate the amount of motion blur too so you could stop it when you want in an animation.
I just wanted motion blue effects on a menu system I was creating.
I could do it manually but I'm not going to bother. It'd mean having to create extra layers, and putting alphas on them in turn to create the effect...
Oh well... thanks for that