As far as I know, the only thing moddable about the rtw AI are the formations it uses on the battlemap.
The rest is hardcoded.
Stuff like recognising height advantage is there, but is only used for defensive battles (at least, I've noticed that in defensive battles the AI always deploys on the highest hill he can find).
From what I've read, the AI in MTWII is more moddable, so perhaps we'll see some improvements in this area for EBII.
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