I read your comments as trying to do the same thing RX-79 was trying to do: combine safety/readiness conditions and action types into a single list.
If I misinterpreted, my apologies. If you were just addressing safety/readiness conditions your list is correct as far as it goes -- but maybe you didn't go far enough. (That said, Col. Cooper's list, shown below, doesn't go far enough, either. But it's an old list and really seemsfocused around the military use of the 1911 platform.) Here's your list again:
Here's Cooper's "readiness conditions." You'll note that he spoke of full magazines. While the magazine clearly doesn't have to be FULL for the gun to be ready to fire, it does have to be full if you are going to be READY for a combat or self-defense situation.
Condition 4: Chamber empty, empty magazine, hammer down.
Condition 3: Chamber empty, full magazine in place, hammer down.
Condition 2: A round chambered, full magazine in place, hammer down.
Condition 1: A round chambered, full magazine in place, hammer cocked, safety on.
Condition 0: A round chambered, full magazine in place, hammer cocked, safety off.
A lot of guns, nowadays, start from a semi-cocked state and don't have safeties. That semi-cocked state affects what happens next when things don't work as they should -- as is noted below.
Most decocker-equipped guns don't have safeties. A few that do (like 3rd Gen S&W semi-autos and the Beretta 92/M9) might perform both functions using a single control, and you might have to decock before you can engage the safety. These guns act like Condition 3 guns only for the first round fired.
While most DA, SA, or DA/SA guns can be function from condition 1, and several can do so starting from condition 3, too, DAO guns are typically found only in condition 3 -- never condition 1. DAO guns are only cocked at the end of the trigger stroke -- they have no real need for safeties! Any DA/SA gun that can start from fully-hammer down, can fall into condition 3, too -- for the first shot.
Glocks and similar pre-tensioned striker-fired guns (and a few pre-tensioned hammer-fired) guns don't really fit any of your conditions (or Cooper's) -- as these guns are
almost -- but not quite -- DAO guns: if the round doesn't ignite, a gun that started from condition 1 suddenly changes to condition 3 -- you must rack the slide and load a fresh round before you can fire again. (As noted in earlier responses, a few of the "pre-tensioned" guns do have a true DA function -- pulling the trigger will cock the hammer or striker AND release it too.)
While SAO guns fall into condition 2, so do some DA/SA guns. Some DA/SA guns can start that way (in DA mode) and function in SA mode with subsequent shots. (Are we talking Action Type mixed with Readiness Conditions, again?) I'd argue that "Readiness Conditions: shouldn't be limited to just the first shot -- which is why, I think Cooper mentions a full magazine in his list (shown below).
Cooper's readiness conditions don't fully address modern striker-fired guns, -- but some partially cocked striker guns are only little different than a DAO gun -- and in some, little different from a SA gun -- even if the gun is equipped with a safety lever. Some are.
Some partially-tensioned striker-fired guns DO have safeties, and Cooper's scheme sort of works with them. Some partially-tensioned striker-fired guns can be fully decocked. Cooper's scheme works with them, too.
