S2 battles were working nicely at the end. The game was beautifull, an aesthetic success. But I found the campaigns rather boring too. On a role-play level this game was really too one dimensional. Every faction's purpose being to grow bigger than the others and conquer the whole map. At the end there were just three or four huge empires. No small or mid size factions left.
Another thing, the ennemy generals and daymio were much too suicidal and I always found very frustrating not to being able to have a long ware with Uesegi Kenshin or Takeda Shingen for more than one turn because he would die in the first battle against my armies or another AI army.

Now about this thread's original question, I'm afraid gravitas doesn't have any use for agents.