I will bring it up for discussion in a modding meeting.
I'm truly grateful for any attempt.
What's wrong with the current reinforcement system (1.8.0) and how would an increased cap help?
In short, the reinforcement's soldiers are not organized. If we can increase the battlesize, there will be no reinforcement any more. Even if there still is, their soldiers are too little to be a problem.
In whichever edition, AI's cavalry charge and die first, and then infantry and archers. Then the reinforcement is generated and charge with no organization. their footmen and archers spread everywhere and fight like skirmishers and their cavalry harasses my archers. My archers have no arrows now because we are the winner and have no reinforcement. If I send cavalry to counter their cavalry and archers, they will be killed by their peasants. Oh, peasants. They're horrible. So my only choice is making everyone charge.
You see, AI has no tactic to win of course, but has a good tactic to consume the player.
The main problem before 1.8.0 is that sometimes the enemy's reinforcement is generated behind the player's army when the player's army pushes too far. I haven't met this problem in 1.8.0 because most of the time the enemy's soldiers were so many that they preferred attack more than defence. In the rest of time they didn't have reinforcements. So I don't know precisely the difference between 1.8.0 and editions before.