Yes, I think that this kind of selective antialiasing would need
a 2-pass approach: The first pass would be a regular rendering with 
no antialiasing, which marks pixels as "this pixel and its surrounding
pixels need to be antialiased" and "this pixel is not antialiased".
The second pass would raytrace the required pixels antialiased.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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