I like the idea of swapping out the spur-less hammer, especially on the larger 6906, but have never gotten up the courage to change it. Detail stripping a 1911 is about the limit of my gunsmithing skills; quite frankly, the 3rd gens intimidate me.
I learned to shoot DA/SA back in the day with a 39-2 and a Walther P 1. I was taught to use the decock lever but to ease the hammer down with my thumb. Seeing that hammer slam forward gave me the willies.
No doubt this decocking process was a holdover from the concern of WW2 era Walthers that had suspect heat treatment for the firing pin block. I'm sure it's totally unnecessary with modern steel and QC. Still, old habits and thought processes are hard a-dying.
I also remember one of the early issues of American Handgunner that did several stories on the S&W 39. A very young Massad Ayoob had fulsome praise for the gun. Rather than using the DA trigger for his first shot, he would cock the hammer during presentation and sweep his thumb down to get it out of the way of the recoiling slide. This way he didn't have to deal with the transition from double action to single.