I am an expert (sadly not in Biology). I voted for this site because I love to learn and am always curious about what people who actually know stuff have to say, on most topics.
Over on SO (where my expertise actually counts for something) things have been going downhill. There is a great deal of spiteful down-voting, questions being closed because united teams of "fanboys" shut them down, and the whole enterprise is moving towards something that is much less open and inviting than what it was 3/4 years ago.
I would strongly encourage you guys (and gals) to not stifle layman participation. There is room for everyone, and if you look at the questions you currently have, the vast majority of them are exactly what you've said you want... highly technical and entirely on-topic. The bottom line is that you WANT people like me here. I promise not to pollute the space with mindless drivel, and I was already able to offer a reference to a study that was relevant to the questioner, even though I picked it up reading a popular science book (Incognito, by David Eaglman).
If nothing else, I'd wait to really get engaged in this whole concern until there was something to actually be concerned about! At the moment there's no evidence that anyone is coming here to post questions about what hormone they should be taking to sound (and look) more like Justin Bieber. My advice (as a long time Stack user) is to not overreact and just see what sort of participation you get. Ultimately, if the experts you're so hoping to woo don't see the value of using this format, I seriously doubt it will have been because of the occasional question that is just slightly too broad!
And lastly, the question in question (that was closed and re-opened)... it's a GREAT question! And I challenge you to quickly and easily find an answer to it, online. Keep in mind that in order to find a good answer, you have to be able to ask JUST the right question, or the search engine won't know what you're after. And it's not a generic biology question. I seriously doubt the average biologist knows the exact mechanism by which the brain's neurons communicate and how the electrical impulses are generated. I suspect (and I'm entirely prepared to be wrong here) that this is something that biologists who don't specialize in neuro-science, would have to look up, just like anyone else.