A couple of observations about plowing:
Not sure if #10 is better than #52 for plowing. When we were double heading to plow for the 2007 Christmas trains, the problem was that #10 would slip on the snowy rails. At that point the speed would drop quickly to zero.
The plow that is on #52 now is designed to lift and throw the snow, and when the speed drops below the point at which the snow is thrown off to the side, it quickly builds up a pile in front of the plow and stalls. If you watch the videos you can see when this happens.
As for turning #10, personally I would love to be able to run the other way once in a while. I bet if it was a priority then our brain trust could figure out how to do it without a real turntable.
Right now, #9 faces south, or at least the frame and cylinders do. It wouldn't be a trivial exercise to change that because the frame and cylinders are pretty heavy and are currently on blocks, so they would have to be put on some sort of shop dolly, backed out of the shop, and turned around somehow. I haven't heard of any plans to do that.