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> Usually you want to be able to control color mapping after the render.

Theoretically yes, but when color mapping is an integral part of the image's 
aesthetics, it's often more practical to have it done at render time, rather 
than having to open the image in Photoshop and change it each time with the 
same settings. It's not uncommon to create scenes that depend heavily on 
color mapping to look right and having to correct them at each iteration of 
the creation process would considerably slow down the workflow. I guess 
that's the reason why the feature is included in most (if not all) high-end 
renderers.

G.

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