I would be curious to know at what point in applying regen, other than through the brake pedal, Kona decides to show the brake lights. It's probably a complex algorithm, and I hope it doesn't cause the kind of thing that happens when the driver in front of you is driving with both feet.
My Chevy Volt does it by deceleration g-force I believe. When it is set in light Regen the brake lights don't come on but in hard Regen they always come on when I lift off the accelerator.
Im going to add something to my wishlist. An icon on the HUD when the brake lights are lit, would be a nice feature.