New answers tagged layers
Although quite laborious, one way to get to where you want to go would be to edit the raw file globally in Lightroom and export a separate version of the entire photo edited specifically for each of the areas you wish to develop differently. Then combine them using masking and layering in photoshop.
As far as I know, the only values that can be brushed are the ones shown in the brush. I would guess that Adobe feels the others are out of the scope of lightroom, which is "only" a image editing tool, not an image creating tool like photoshop. So maybe you'd need photoshop and use the RAW file from there.
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