Sport plus only comes with sports chrono.
No. You can get Sport Plus from Tequipment. I did.
LC is only active with Sport Plus active.
It wasn't there before I had it 'installed'.
(and by installed, I mean the fiddled with the software and added a button - the capability was there all along, of course)
Update after reading all the misinformation above: Flooring the throttle from braked standstill is gong to be fairly quick, but it's not the programmed LC unless it's enabled in the software and Sport+ enabled (caveat, my Turbo is from 2014, Sport+ from about 2 months ago).
Doing LC properly means priming the clutches, building the boost, setting optimal shift points and TCS settings.
Any contrary to some posts, too much steering angle will effectively disable it, but it'll certainly be fun :)