I've been playing this game since its release. One of the issues that has bugged me was the AI's fixation on concentrating all its forces at the capital for no real reason. For example, in my current game as France, I built up and reinforced the British army in Portugal and Spain, organised it, and literally marched it 1 province away from the main French army in Spain, and then left the AI to play the following turn automatically. What happened? Wellington's Army stack was shorn of a couple of divisions which were sent roaming northern Spain. The formed corps just spread out with the exception of two which were defeated in a pitched battle. All it had to do was literally march 1 province and overwhelm my French army.
Is there a way to prevent the AI from doing such things? In particular, is there a way to stop it from spreading itself thinly? Maybe a setting in options or something?