I think you mean "single action revolver", not "Single Action Only" revolver. That term, just like "Double Action/Single Action" are misnomers in that they are more recently coined terms of action types which have existed for many years. Sorry, just a point to give.
Meh... I don't see a problem with labeling an auto-loader as DA/SA. Very nice to distinguish it from a DA revolver, which will fire DA every time, unless you pull the hammer back!
I have a Bersa Firestorm, which is DA/SA, and a Jennings J-22, which is SA w/ blowback. They both fire the exact same after I chamber the first round. It's nice to quickly tell that I'm looking at a an auto-loader when I see DA/SA. It's a quick annotation.
SAO, on the other hand.... That is a bit unnecessary!!
How does one carry a SA revolver? Do you carry it hammer back like a 1911, or hammer down on an empty chamber like an old DA?
The NAA mini-revolvers have safety notches between each chamber of their 5-round cylinders.
I think it would be incredibly difficult to see an accidental discharge with their safety notches.
Single actions are great for hunting but when the potential to encounter a BG, or multiple BG's, with semi-auto pistols, you could find yourself in deep kimchi.
This is so very true.
Just the other day, I was researching the ability to distinguish a DA revolver from a SA revolver
without pulling the trigger. I fell short of my goal after finding an article by a man who mentioned when one might prefer a SA revolver...
His answer was that SA is no good for human "opponents"... but when hunting a fast & fierce beast that is running at you, a DA trigger might not yield the best of accuracy & you more than likely wouldn't take your time to cock the hammer. The SA revolver forces you to cock the hammer out of habit, and take your time with the aiming. Instead of running out of ammo, you could potentially save your live by taking your time.
Just something to think about.
EDIT: That said.... I am looking to carry a NAA single-action revolver (probly the Black Widow) with me all the time. I hope to never have to pull out my gun at all, but if I do... that means the lightest gun possible has the most chance of being on me EVERY day. I'm not going to be carrying a gun that's more than a pound when loaded. Half a pound is close to my limit.