Launch control is only required on an auto box - you don't need it in a manual because you can launch it yourself by dropping in the clutch at the right point.
That's all the launch does, it allows you to put your foot on the brake and let the revs rise before dropping in the clutch when you pull your foot off the brake.
Works pretty well too, though I have no idea when I would ever try it again (you have to do these things once though huh!)