I think it would be possible to render first a non-antialiased image
and then make a second pass shooting more rays where necessary in order to
antialias the image.

  POV-Ray still works as it worked 10 years ago, when computers had just a
few megabytes of memory (and thus loading a big image to memory was just
out of question). Nowadays keeping the entire image in memory (as an option)
would not be such a burden as it was 10 years ago and thus all kind of
extra passes would be possible.
  Perhaps POV-Ray 4 will change to this ideology...

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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