no they don't assist hatch. I guess they know that if a chick cannot overcome this first hardship in life, it will be weak and unable to overcome hardships later in life.
My Dutch Bantam is NUTS about hatching. Not a week after she's done with her last batch she wants to hatch more. I am hatching some for the neighbors, but i don't know what I'll do for the next three years when she wants to hatch. My state will be overrun with chickens!!! She just hatched out...