[Raak] Yes, the typesetters did me wrong. I think you're going to have to elaborate somewhat on your suggestion, though. If the sole difference between "X is wrong" being true and false is whether those with moral insight think it is, then that doesn't seem to me to be a very strong claim. Are you basically saying that things are right/wrong because most people (or most appropriate people) think so? But clearly this is quite different from normal propositions - for example, "Jupiter is the largest planet in the solar system" isn't true or false by majority opinion, and neither is "There is a God." Normally we think of propositions being things that people recognise the truth or falsity of, rather than things that they determine the truth or falsity of. Alternatively, if you think that those with moral insight are in fact not determining rightness/wrongness but recognising it, then that begs the question on what grounds these people see that X is right or wrong. Do they just "see" it with Enlightenment-style infallible conscience, with no further explanation? This is quite apart from the problem you suggest yourself, which is how to recognise those with authentic moral insight, and how to deal with the problem of disagreement over morality.
[Raak] I know you're not fully taking the position that there are naturally some people with greater moral authority, but it's interesting to compare with the libertarian worldview which (without knowing much about it) I would have thought would rely on the idea that morality is personal and subjective.
As you say, it doesn't advance things much to suppose there are those with moral insight, since it's basically a deferral of the question about the source of any objective morality. For "God", read "the enlightened". You thus can't move on to asking "how does one acquire moral insight?" without committing to the belief that there is such a thing, so a leap of faith would seem to be required. Definitely not one I'm prepared to make based on my experiences.
[Bm] Moral propositions (in the view I'm setting out) aren't true by virtue of being believed, they are true objectively, and those able to see them believe because they see them. How do they do this? Well, how do you (for example) recognise the ordinary physical objects around you? There's no "how" involved that we can say anything useful about (at least not until non-invasive brain scanning technology improves in resolution by many orders of magnitude). The same for moral perception. How people get to be able to have moral perceptions is more answerable in the here and now: upbringing, spontaneous revelation, or learning from enlightened people. [Projoy] If there is such a thing as moral authority at all, then some people will have more of it than others. I don't know where that "naturally" comes from: if it's an elite, it's one that anyone can join, the same as authority about temporal matters. There is indeed an act of faith involved: the faith that there are objective morals. But there is also an act of faith involved in the perception of physical truths. The main difference between the two is that most people's physical senses function at a high enough level that it is easy for all to agree on simple physical statements, while the same degree of consensus is lacking in the moral realm. One difference, at any rate. Another is that people are much more attached to their moral judgements than their physical ones.