Earl,
I like the look. Great intergration.
I agree that it is difficult for other to see our cars brake lights. I converted my red lens turn signal only lights to also fuction as brake lights. So with the brakes on all four lens light up putting twice the amount of light out. But still it is low.
I have thought of a 3rd brake light but as others have said: location. I have wanted to intergrate something into the roll bar, but I didn't want to compromise its primary function.
http://www.hyperlites.com/
I was thinking about purchasing some of these blinkie lights and fixing them to something in the rear. My other thought was again converting 2 of the brake lights with the blinkie circuit. Allowing 2 lights to blink 4 times (in ca mode) before going solid.
...maybe I should just stay in the gas!