For Commerical users you can modify it to the following and you'll have motion blur but it is slow (about 10 fps) until I can come up with another method. Can commerical users access camera.bmap at all? ->

function main()
{
blurmap.alpha=50;
//blurcam.bmap=bmap_for_entity(blurmap,0);
cameramove();
}

function cameramove() {
proc_late();
while(1) {
vec_set(blurcam.pos,camera.pos);
vec_set(blurcam.pan,camera.pan);
bmap_for_screen(bmap_for_entity(blurmap,0),1,0);
wait(1);
}
}

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Do shaders have access to the screen texture?