To get right absolute density there are two important factors.
From one side if you burn (for example) 100 sectors physically shorter, i mean with thicker density, then those sectors will be read in shorter time than usually.
But from another side all those sectors are then physically closer to the cd's center.
And you know, the closer to the center, the slower is reading speed by Constant Angular Velocity. It happens, because the torque at the beginning is slower than at end. I think, it will be very cpu intensive process to calculate both those factors. Who knows, may be there are more factors to calculate.
PS: the same happens, if you burn 100 sectors physically longer, sectors will be read in longer time and they are then physically farther from the cd's center.

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