MCing the scout has been considered an exploit for ages. As for pulling the tempest before the gauntlet starts, I wouldn't recommend that; I've heard of two entire separate raids being banned for doing it.
I always assumed pulling the Tempest first was an exploit, which is why I've never been interested in trying it. I wasn't really sure about MC'ing the scout, but it's good to know.
That being side, it proves to be solid motivation to teach people the right way to do it the first time they come with our timed runs. It's not really any more difficult, though it does require people to be alert earlier in the gauntlet.