Omitted this. The Cab AUX buttons are used toI set the voltage settings on the AVC. The AVC must be in setup mode the with the AUX buttons and the L M H you set the voltage outputs for the device when you select it with its TR ID.
Your usage plan is a "mixed use" idea. The wiring to the stub tracks, transfer tables and other accessories needs be thought thru. It isn't obvious to me how you would split the output from the AVC to accomplish this And the other accessories as well. The interaction with the Cab could become confusing for powering the stubs an accessories. I am not sure the transfer table operating controller can work from the Cab control.
With respect, it might be simpler to take the AVC ouptput to an accessory bus, let it, thru toggles for the stubs and the accessory switches, operate your items.
Just my observations - no more
ralph