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This is my mistake. I now am seeing non-zero FAST responses as I expected, so I am not sure what I was looking at earlier. One can see in the code that the absolute value of the score ( the sum of the absolute difference between the pixels in the contiguous arc and the center pixel ) is in the Keypoint pushed onto the vector of Keypoints.
My other point still stands, as I think it would be worth knowing whether the keypoint is a positive or negative keypoint. Perhaps in practice brute-force matchers break early on such a discrepancy, but it seems likely that it would save computation for detectors to return two vectors of points.
