Just saw this over at the official forums.
http://p223.ezboard.com/fshoguntotal...ID=13698.topic

Quoting Granville69 (CA coder):
"I can assure you that a patch is underway but I cannot give you a time, let's just say it will be the near future.
I can't go into too much detail but I'm happy to say that the AI will be much improved in both the battles and campaign map, as well as many of the issues which have been spoken about on these forums."

Looks like there's hope for the future indeed.