King's Bounty: Armored Princess

You can never have too many soldiers! I specifically want there to be more warriors in the stack than I can manage with my leadership. What will happen if the troops don't have enough leadership? Will they refuse to fight?

They won't refuse to fight, but they will go out of control and move/attack/use abilities on their own, like in auto-battle. Which isn't very good :)

Is there an option in King's Bounty to enable auto-battle, like in Heroes 5, so that the outcome of the battle is decided before it begins? Because it's really annoying to fight with cheeky "weak" units.

In Princess, "weak" units seem to run away on their own, and it's quite difficult to catch them. Or does this only work for "very weak" units? I haven't played in a while, so I don't remember.
And there doesn't seem to be an auto-battle like in Heroes. You can't avoid the battle.