The DC is what law enforcement was sold when buying through the department. Its so the decock automatically goes back into the fire position, instead of having to place it out of the safe mode manually making it fire ready. My son in law used, mine now, the saftey/decock P944t for almost 2 years as a reserve officer. He had to make sure it was out of the safety mode before going on patrol.
I was thinking about seeing if my P944T would be able to be converted, but as a CCW gun I think I like the idea of it being in the safe mode should it just happen to fall out, or be taken out and get put into the wrong hands. It gives me time to run, should the person holding it not know how to take it out of safety.