Done 30 boils in the last 6 years, always put andouille and pecan crusted jalapeno sausage in mine. Not one complaint on it doing anything to the boil but make it better. I also always try different veggies, carrots this year, to my boils.
My extras are corn, potatoes, garlic, onions, lemons, mushrooms, brussel sprouts, and sausage.