" I would appreciate your comments on the following:
Is it possible to have the ditch lights flash alternately at any speed when running DC only?
Is it possible to have the ditch lights on solid at higher DC track voltage and then alternate at a lower DC track voltage?"
Unfortunatelly, the Analog mode (DC) does not allow to perform any programming including the light set up operations. Those functions can easily be applied in a Digital mode (DCC)