If it was available in SP
It was.
Color me clueless.
But then I suppose, being Executive Moderator, you would have noticed it more than I would have because I barely get a chance to read half the posts on the forum.
Now, when it comes to technical stuff, like how is it that the forum can successfully handle posts that are occasionally made at the same second or even within seconds of each other and not get them confused, then I'm your man.
(The answer is the SP forum employed file locking, whereas SE employs transaction locking in the MySQL database.
)