1) So its fine to let Pike and M'Benga die because the Commanding Officer is a coward? I don't think, for example, that Kirk would let someone in his crew die because of a Commodore/Admiral being a prick. Starfleet Officers having to disobey idiot superiors isn't that rare, its just usually a guest star superior officer and not a main cast character. Hell Spock eventually risks the death penalty to help Pike, which by your logic should have ended with his execution despite the fact that he did end up helping Pike but disobeyed while doing it.
2) And they were wrong, and peoples lives were on the line. Again, a good Starfleet Officer is NOT a military officer, and they don't just mindlessly follow orders.
3) A Stafleet Officer doing something against the rules but being right is not a rare thing in Trek, and in any other case they'd get a pass because they were right. Thats the risk to them, if they succeed they're good if they fail they're in trouble.
4) If that one Klingon hadn't decided to go down in a blaze of glory then Ortegas plan wuld have been the only thing that could save Pike and M'Benga. Every second mattered, but Una was a coward. A good commanding officer would have said "screw the treaty", especially since the Klingons were visablly breaking it at that point.
Ortegas did the right thing, Una should be cort martialled for cowardice. All of your points are the kinds of things a bad Admiral would say in a Trek episode where they are the antagonist, if Kirk was in command of the Enterprise at this point he'd have gone with Ortegas plan immediately, been correct in doing so, and he'd give Ortegas the praise they deserve.
Also, if they had gone with Ortegas plan from the start and not wasted time on the cowardly route, Pike and M'Benga would have been saved a lot quicker. The delay did nothing but put them in mortal danger, in fact it calls back to the end of SNW season one where we see that Pike's cowardice during the events of the alt history Balance of Terror would have doomed the Federation. Some missions need commanding officers capable of being proactive and Una is completely incapable of that, she's a petty coward in this episode who punishes someone for doing the right thing because it hurt Una's ego to realize that she screwed up.