Years ago when I started USPSA (no IDPA in the State) with my 75B, the RO's would get all upset about manually lowering the hammer. With a lot more CZ's now, not so much an issue. I will say those same RO's, who were perfectly fine now with me doing that, had an issue again when it was a woman doing the same. People can be funny about some things.
I shoot a LOT of 3Gun, and different matches have different rules with regards to handguns. Some allow mag and chambered, holstered. Others are mag inserted and holstered only if you are not starting with the pistol. I finally just went to mag inserted and holstered, not chambered unless I am starting with pistol. I had a couple of RO's complain to me since I did not chamber at a match that allowed it, even if you were not starting with the pistol. Since I practiced that way, drawing and racking the slide were second nature, so if I chambered I would most often eject that round when I draw. Funny how in being safer (in a sense) would make them all weird about it. Funny, this year that same club has gone to empty chamber starts too, which is causing issues with the other shooters used to the other way.