The scene where the Starfleet commanders present their plan to rescue Kirk and McCoy to the president was interesting. It makes the whole situation a bit more ambiguous: did they really want to save Kirk and McCoy, or did they plan to actually pretend this was an operation to save them, when in fact they intended to kill them? If they did intend to save them, then doesn’t that mean that the conspirators did not all agree about what to do with Kirk and McCoy? Chang clearly wants them dead, yet he’s working with colonel Cartwright and co who wanted to save Kirk and McCoy. This scene is also an opportunity to show the conspirators a bit more (in the theatrical cut, the Romulan ambassador has only one line!).
Good point. Though this scene does create issues if you judge it against the larger framework of the franchise.
While it's plausible that the Romulan Ambaddesor might be called upon to attend a meeting to discuss the assassination of the Klingon Chancelor, it is completely impossible that Starfleet would discuss a rescue operation in front of him. Throughout the entire Trek history the Federation and the Romulan empire have been in state of (cold) war.
Interestingly the films barely ever feature the Romulans. Trek 6 gives us the first and only proper pointed eared looking Romulan.