Good Morning out there in Radio Land!
First of all let's knock down some of the cob webs in this thread.
In all my operating experience with the DCS-RC system and the full DCS-TIU Rev L system, the MTH equipment never started up an engine without a command from a handheld controller. All the problems I have had always came down to a malfunction of boards or battery problems in the engines I was working on for repair.
When this modification to the DCS-RC came to the light of day, it seemed like the answer to the problem we have with operating a yard in a club layout. Members come to run trains, they do not have the time or knowledge to follow a long list of do this before that, then put a foot in and shake it all about.
So when the boards came to install, which GRJ can say were done correctly, it was not a cause for joy when three different engines, both PS2 and PS3, all started in conventional mode with the modified DCS-RC-WD controller connected passively across the power source to the track.
I realize that the functions of control with a handheld are lost with the addition of the board into the DCS-RC, but with a longer timed reset cycle could you send a data string to a engine between resets?
Now that the pot is boiling again, I will wait and see what cooks up today.