Best workflow for more control over specular reflections

Hi all, we were trying to stick as closely as possible to using PBRMaterial for consistency. However we would like to have a little more control over specular color and it seems using PBRSpecularGlossinessMaterial is the correct path to do this. Is there a way to get specular color working on PBRMaterial or should we be using PBRSpecularGlossinessMaterial instead?
in the PG example if you switch to PBRSpecularGlossinessMaterial you can see the specular being tinted Red which is what we want. However when using PBRMaterial, metallicReflectanceColor seems to be ignored unless metallic is 0.

you can either use metal/rough workflow or spec/gloss within the pbrMaterial:

As long as you set either metallic or roughness you will be in metal/rough mode otherwise you will be in spec/gloss mode where reflectivity and microsurface will be the corresponding properties.

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