I agree, this is one of the most useful mods on the entire website.
Here's a small hint to how to run the bat automatically:
Create a run.cmd file next to teardown.exe and put there the following content:
@echo off
cd create && custom_maps.bat && cd .. && start "" teardown.exe
Now you can use this file (instead of the .exe one) to start the game with fully automated custom maps… kind of. A quick and dirty yet working solution.