Correct, in the S position the car rolls back. Putting it in W, (which is starting in 2nd gear), is like stomping on the brake. I wrote Frank King, the MB club guru, about the pluses and minuses of daily driving in the W position, ( I don't need to be the first one to reach the other side of the intersection), and his reply was fine. there would be less wear on the trans and should give better fuel milage. so, we leave the swich in W, it drives just fine and we have the "hillhold".
Like the first question in the thread, there used to be a "hill hold" effect that ain't there on the '94 &'95. Still hoping for a hi-tech person to jump aboard this one. Thanks again, Ed