Animatable Directional Blur node?

Is there any way to vary the strength of the zoom in the directional blur node as animation progresses??. Ive tried the normal blur node with a timer node, but that doesnt quite get the same motion blurring effect.

I’m not sure what you mean, but you may want to look into vector blur, which has direction and speed:
http://wiki.blender.org/index.php/Manual/Vector_Blur