Uuurgh...

Oh well, I'm kinda happy that this will make it harder to kill the enemy generals.
Also, since the autocalc doesn't give double traits, the AI shouldn't get the full scarface until it's fought an average of 14 battles (4 threshold / 0.3 chance).
And if you've modded the game with double comabt trait thresholds, it would be an average of 27 battles before the AI gets scarfaced.

How did you test it? I'm guessing you used the "less than" 0.7 fix, raised the chance to 100 (and deleted the roman-only scarred chance), then autocalced a few battles, and you got "been in the wars" after every battle - right?