AI_No_Recruit
This mod disables AI recruitment of the crappiest troops, meaning they will use their national troops a lot more and construct more castles.
I did not make this mod, I simply ported it to Dom6, made a few changes, and verified that it runs. There might be new crappy units in Dom6 which are not being disabled by this mod. If you would like to help update it, feel free to take ownership of the mod.