Is there are some meaning to capture other faction soldiers? Once i’ve captured sinedrion soldier via paralysis. But i don’t get him as a prisoner or something else. Maybe capturing increase chance to loot his equipment?
Lol non lethal win should not raise their rage as much. 
I noticed often soldiers of New Jericho was escaping the combat before to be killed, I wondered if it had any consequences. Perhaps more or less population.
More likely would affect their remaining defense points vs haven attacks, if there’s any effects.