If you read that dictionary entry more carefully you'll see that the implication is always negative: it's a disappointment that the thing only happened once, instead of persisting as one would have hoped. A flash in the pan is a failure. That's why it's confusing to call the Book of Mormon a flash in the pan when you mean that it was something uniquely wonderful.
Anyway, so what if Smith never produced anything else like the Book of Mormon before or after it? How the heck is this any kind of argument at all to say that he couldn't have produced it? Is there some kind of rule that if someone can do something, then they have to keep doing it over and over, and if they don't keep on doing it again year after year then they can't ever do it at all, even once? Connect the dots for me, here; fill in the steps. He didn't do it more than once, therefore he couldn't have done it even once, because ...?
Multiple witnesses declared that Joseph Smith spoke the words of the Book of Mormon rather than personally writing them.38 This observation separates him from more than 99% of all authors who ever published a book.
First of all, these witnesses were all either deeply involved in the whole project themselves or else only saw a brief episode. We can hardly be sure that Smith really didn't write or revise anything. Secondly, how the heck would it have been impossible for him to dictate the book? Most published authors do a lot of rewriting because they are trying to avoid literary and stylistic faults like those with which the Book of Mormon is riddled. When a famous professional author says that you have to do a lot rewriting, this is like an A-list movie director telling you that you can't make a proper film for under a hundred million dollars. That's totally true for the kinds of films they make, but it absolutely does not mean at all that a kid with a smartphone can't put something on YouTube. In the same way, it's totally true that real literary masterpieces take a lot of rewriting, but works like the Book of Mormon do not.
I don’t think I’ve linked to it yet but this essay written by one your favorite people goes into length on Joseph Smith as storyteller and what hurdles would have to be jumped in order to compose the Book of Mormon.
What this person does is to list a bunch of things they've counted in the Book of Mormon. What they do not do at all is show how any or all of those things would have been very difficult for Smith to produce. What is so difficult about them? They all actually amount to the same single thing: that the Book of Mormon is long. Anyone can dictate a long book. Just keep talking. And then let a dedicated apologist pore through the result and find things in it to count.
From what I’ve read on this topic over the years my opinion is simply that you’re giving Joseph Smith too much credit for doing something that would have been beyond his reach.
I think Smith was an unusually talented person, with the kinds of gifts that show up in maybe one person in a thousand. You apparently find it so hard to believe that he could have been one in a thousand, that you are forced to conclude that he was one in a billion: the modern Prophet of God. This is like finding it so hard to swallow a mouse that you have to gulp down a whale.
You’ve asked me to go through Grant Hardy’s book and spoon feed selections and ‘proofs’ that had meaning to me and yet you’re not willing to read it. The only one here that I’m aware of who says that they’ve read it is honor. He, of course, has his own opinions on what is in the book. But at least he says he’s read it. ... I’ve provided links, not a few, in this thread that let the experts speak for themselves in regards to their research into Book of Mormon origins/translation.
Why do you think I would learn anything from these books, if not even one point sticks in your own mind from them, with enough clarity that you can easily explain it in your own words? Doesn't that mean that they must be pretty bad books?
Somebody who claims to have gotten a lot of sound information from books, but complains about having to spoon-feed when asked to explain any of it, is like somebody who claims to know a sure-fire way to make a fortune, but cannot afford lunch.
I was a teenager before it was cool.