Nice. I found this comprehensive and easy to understand-- I haven't tried to tinker around with my descr_strat yet, but I will tomorrow.

One thing, though, I think that the earlier part, about unlocking factions, does not work. Only doing that leads to a CTD when you click on the previously unplayable factions (Spain, Numidia, Thrace, Pontus, Scythia, Armenia).

I think (in v1.3 at least) you need to edit the campaign_descriptions.txt file in Data/text, add in descriptions for the newly playable factions before it works.