I'm also

but also trying to make sense of
"“Whether a customer wants to take weekend road trips, go road racing or compete in grassroots drag racing, we aim to maximize the driving experience for everyone,” said Pericak. “Mustang offers selectable drive modes for those who prefer to compete on road courses or in autocross events, so when we realized we could provide a really cool feature like electronic line-lock that no one else offers, the decision was easy – ‘Let’s do it!’”
According to Ford, the electronic line-lock for 2015 Mustang GT is intended for use only on racetracks. Racing your vehicle will void your warranty. (

)
The line lock system is reportedly easy to use and operates through the Track Apps option, but beware, excessive burnouts may cause premature tire wear!
But I still think it is cool...