Use 2 water pans in the roaster to make sure that you capture as much heat as possible. Insert BBQ racks with cast iron griddles over the other 2 spaces. 1 water pan could be used as a hot hold for items you are just warming or to hold items when cooked. Use the 2nd water pan with an insert to make scrambled eggs.
Scrambled eggs: Spray with non stick cooking spray and add your beaten eggs. Close the lid and wait till the eggs start to coagulate. When the liquid eggs begin to start resembling scrambled, mix thoroughly every 5 mins until the desired texture is reached. Doing it this way you can make scrambled eggs for a large group.