As far as hitting ropes and cords I wunder if you could or more to the point if they make a line cutter that would attach to a rig like that. I did read that the new drive is spose to snap off if you hit something and leave the hull water tight. I think it's a great idea they (according to the article I read) turn 30% tighter than any other drive out there.
I'm still not sold on them yet but for bigger boats they should be a good option.
