hi, I'm replacing the 3 light switches in my entrance way. the 3 light switches are in the same triple size phenolic looking box. (two 3 ways and one single). the switches I'm removing had no ground screw. the new switches have a ground screw. all the grounds from the six romex wires entering the box tie together with a crimp connection. I'd really rather not add any addditionl clutter in the box if it's not necessary. Can I replace the switches and not bother with the ground screw or is that a violation since the new switches have the ground screw. Thanks