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The wavelength curve the rods are sensitive to spikes in the middle of all the wavelengths curves for all the cones. So I think the mental sensation of gray is pretty accurate, actually, since it is close to being just a rough measurement of all the others.

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You are saying that the rods' spectral curve response is collinear with the cones. That would do the trick, but I'm a bit surprised as I don't see any reason for evolution to push you in that direction.

Do you have a reference for this? Quick googling seems to show that the rods' response curve is not, it seems to be a most sensitive at a wavelengths between the peak of the blue and green cones.

I'm not sure if this will satisfy you, but you can give this a shot:

http://en.wikipedia.org/wiki/Mesopic_vision

http://en.wikipedia.org/wiki/Purkinje_effect

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