Room temp and humidity , can help so you can store eggs longer, no need to cover. After 10 days hatch rate will drop , but not much untill after 14 days. Reason to turn eggs that you are storing same reason you turn them in the incubator. The hen turns them every time she goes to lay another egg in the nest. I set eggs weekly cause its lot easier knowing the chicks will be hatching same day each week.
Can you hatch chicks ,without doing this yes, but best hatch rate if eggs are stored proper. I have seen eggs that have been store and incubated without ever turning then, and the guy still hatch some, he didn't know. He does now with alot better hatch.