I don't understand most of what you wrote about., but it looks neat.
However, I have a friend who has a regular ZW transformer for his layout and he was concerned that the "full-open" throttle setting that his kids might use could cause the trains to go flying off the track. I wondered if there was a simple regulator that could be wired between the ZW and the layout (his is just a couple of loops) to control the maximum output. The above would do it, but for his purposes would be overkill to the extreme.
