starting off in second in a drag race

I was watching a you tube video of someone drag racing a big bike. He was sitting in neutral and before he starts he shifts it up to second to start in.

This use to be used in motocross so you can start without much wheel spin but I didn't know people did it on the street.

I tried it on my bike and you have to slip the heck out of the clutch but once you get it going it takes off like a rocket. I would like to go to a drag strip or somewhere where they could time it both ways to see which way was better. Not that I spend any time drag racing just was curious about this....