AI and supplies

[Armagein]

I, like many others, have noticed that AIs do not manage supply at all, and, as likely as not, will assemble a large army and proceed to march it around until it starves. It is extremely easy and tempting to take advantage of this situation in a single player game. I want to help the AIs by making supply more plentiful. I have read here that supply is a function of many factors, including population size, province size, type of province etc. My question is this: Is there any map command or mod to boost base supply in provinces so the AI armies don't starve themselves to death.