There has been a discussion on this subject a few months ago on this forum.
In my 26 years of carrying a Remington 870 in a patrol car, the shotgun was always cocked, the chamber empty and the slide release used to put it into action. With training and practice, it becomes second nature to hit the action release as soon as you're ready to put a round in the chamber.
As I posted in the earlier thread, there are several things to consider. First is the firing pin. In the 870, it's about the diameter of a 16p nail, and almost the same length. When I was rangemaster, I found several that were broken from dry firing. Sometimes they will fire with a broken pin, and sometimes they won't. It all depends on how the pieces are aligned when the hammer falls.
Another thing to consider is the chance of an accidental discharge if you get in the habit of working the action and pulling the trigger. It happens, and it's dangerous.
The best course of action is to learn the controls of your firearm, no matter what it is, and use them as they were designed to be used. With practice, their use becomes part of the drill.
I'm retired now, and have been for 14 years, but even today, when I pick up an 870, my finger still goes to the action release automatically.
Hope this helps.
Fred