It’s a great idea! We talked a lot about the possibility of providing “gentle education” to the user in early Discourse discussions. I believe where we left it was “probably applicable to a plug-in”, but I’ve always been a strong supporter of some these common “catch-alls” in the core game play.
I remember bringing up the ALL CAPS OMG YOU’RE YELLING to @CodingHorror as an easy win, and he felt that it just wasn’t as common in practice as we thought. I have a skewed perspective with the communities I’m involved in…some of which are comprised of users less than technical than us.