Agreed, I have suggested a consist editor before as have a lot of people, as seen on another thread it is probably one of the most asked for tools. Hopefully once they finish v2 of the scenario editor they will spend that dev time on a consist editor. I did ask on a stream if there was a third tool to go with the livery designer and scenario editor and it made them pause but the answer was no (I am sure if there was a third tool it would be this)
This is a great idea, I, as well as others, would SO love a consist editor! Doing this would allow us to set up the number of locos, what locos get set up in which direction, and the train car order and number we want, in order to make more realistic train consists in the sim.