This doesn't make any sense! There is no "comfort zone" for these shocks, they will provide the same amount of damping no matter where they start in the travel. I don't see how it could change the wear, other then maybe making it worse due to a smaller sideload moment on the piston.
If you shorten the shock rod, all you will be doing is deleting rebound travel, you won't gain anything. If you shorten the shock can, then you will overtravel the shock and smash the piston into the bottom of the tube.
They would still be bottoming out at exactly the same time. What "bottoms" is the strut can and the top mount, it has nothing to do with the rod. If you really wanted to make it bottom less, you'd end up with the wheel going through your fender. In a corner you'd get so much positive camber that you wouldn't be able to keep the car on the road! If there was anyway to get more travel before bottoming, Ford would have done it already!