Among other things, Zeger Knaepen saw fit to write:

> and what if, for whatever reason, you want the effect of both models
> combined?

Why not allow multiple highlights{} blocks in finish{}?

You could have: 

finish {
  highlights {
    specular
    0.3
    roughness 0.01
  }
  highlights {
    phong
    0.2
    roughness 0.1
  }
}

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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