David,
Actually, your answer was the one I was waiting for. How does the flag, which might be setting on a green with swirling breezes, tell you what is above the trees, etc.? I think it might hurt more than help, and slow play down rather than speed it up.
On the other hand, if they were employed, I think I would use the 10/20/30 rather than the 6/12/18, and see no reason to go to 2 MPH increments - I just can't figure club selection that finely anyway.