I think that the new tools we have for editing units, and the databases they have, could be merged with my old clunky battle simulator into a really nice tool.
thread on Battle Simulator
A "select units and write to a map" method would work. A "select units and update a mod" might allow it to affect a test game on the fly but it seems like it might not be worth that much effort.
The one that I did allows you to build armies in home provinces and then play the mini map. You can script them, then have them attack each other in a neighboring province.
With map commands the army could be built, equipment assigned, magic granted, experience levels boosted, etc. If the command for pre-researching spells ever gets fixed that would be great also. A menu'd method of selecting would make it more user friendly.
Gandalf Parker