I posted a review of my E60 last year and was surprised how many people did not know the car came with factory launch control. So for what its worth I pulled the launch control clip from the video and posted on its own which gives step by step how to use the factory launch control. Enjoy.
https://www.youtube.com/watch?v=nuQQyjjLtIs
https://www.youtube.com/watch?v=nuQQyjjLtIs