1. Campaign: Is there no other way to help the AI getting up a serious economy than giving them 15.000 everytime they need it?
Puny Portugal can afford as many stacks as mighty France can, because no AI faction is in any need for money, anymore. They can spend every way they want and obviously, they do. Portugal and the Moors get 15.000 nearly every turn, which feels a little bit like cheating.
My suggestion: Lower the cap and the bonus, e.g. to 5.000 as soon as 5.000 treasury is reached. (Though that still smells strange to me.)