Now that I think about it, the flash backs have been almost exclusively air cooled. I've only had one older gent in a 997 flash back, and my guess is that isn't his first or only Porsche.
As far as flash warning of speed traps, I'll always do it to warn my fellow citizens. I think speed traps in areas where it's completely unwarranted, just for revenue, are an abstraction of justice.
I will keep the flash alive in my town for sure.