Highlight obstacles near the player.
WHAT
When I drive the car the lights from the car should reflect stronger on the vertical things like powerpoles, rocks, tubes, assembling machines, chests, enemy bases, tree trunks -- anything that I can crash into.

Actually the same should happen when on feet (we have a light on our head -- do we?).
And the same should probably happen in a daytime as well, and with the nightvision.
WHY?
It's sometimes hard to see a rock (or a tree, or powerpole, or a tube). Especially at night. And it won't break any gameplay.

NOTE:
I'm afraid it will take to much developer efforts, but I leave the decision to them as I personally don't really know how the rendering actually works.
It's just a suggestion from my side.