"...to pull out the longer vines and hard weed stalks..."
That's a good point, and one I had forgotten about. By running my BB over the ground with scarifiers down, the BB tilted as far forward as possible, and the blades just skimming over the ground, I was able to clear off most of the dry plant matter.
As far as the remaining grass and roots, it looks as if the tiller completely "vaporized" them! /forums/images/graemlins/laugh.gif