How about this idea:
  Instead of changing the keyword, you can change the meaning of the
number following it.
  Old format: density .02
  New format: density 2500
both meaning the same thing.

  As you say in the documentation, "Actual density per square unit is
n = 1 / (d*d)".

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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