I believe it is included only with the PREMIUM package, regardless of other options. It is called RIDER MODE PRO.
Yes that is the socket where the red plug will go. Look at your paperwork, if you got PREMIUM model the plug would have been in the plastic bag with your manual. Or, should have been.
Yes, once inserted, leave it there forever. It just allows access to further customizing options for ABS, TC (and I think throttle response? maybe not) on the TFT dash menu under the bike settings.
Honestly, its only like 2 settings that you can vary by three positions -
ABS intervention - select Level 1, 2, or 3 ;
Traction Control - select Level 1, 2, or 3
I looked at them, and left them in the default positions which sounded good for me. So even with the plug, I didn't change anything. So not sure it's even doing anything different for me than No plug...?
Seems to work well for traction. The only thing I might like is a bit more ABS in the front, I have semi-locked up the front a few times on dry stony dirt..