Although this feature would be nice, something that might be cheaper for them to do would be just to make the headlights shine a little more out to the sides in the first place. I noticed switching to my LEAF from my prior car, a 2008 Prius (which had regular old headlights), the region of the road covered by the lights left-to-right is MUCH smaller. The Prius would illuminate more to the sides, though not very brightly, so that I could see where I was turning to a little bit.
Current: 2013 LEAF SL (Brilliant Silver), 2017 Bolt LT (Red)
Previous: 2016 Kia Soul EV+ (Titanium Grey); 2013 LEAF SV (Blue Ocean), 2012 LEAF SL (Glacier Pearl)
100% Solar PV (12.125 kW ground-mount)