I had a friend who was given a dozen rock hens and after a week he had a lice infestation in his coop. He butchered all the chickens and painted the inside of the coop with lime. He never had a lice problem again. Good luck.
Some people paint the inside of their chicken coops with lime to prevent lice. I know this works and I've also read stories in magazines that suggest doing this. However, I've never heard of putting lime in a run to decrease odor. I don't know if it's safe for chickens to eat lime.