Hi Bob, I have the same model as you but from 2013. The Smart City Brake only works at speeds up to 18 mph so the likelihood of you using it are low.
When I bought the car, the dealer demonstrated it with the aid of a few cardboard boxes (like all decent American cop shows). It worked fine but even though I have it switched on, I am yet to use it myself.
With regards to the lights, my car has LED daytime running lights but if I leave the light switch in "Auto" the headlights switch on when needed on low beam. If you want full beam then you have to switch this on by yourself. As far as I am aware there is no option for Auto High Beam.
Enjoy the car and if you need any other help, please ask as I check the forum most days