Atonal harmony in the strictest sense depends very much on the original tone row you come up with. All your retrograde and inverted forms of the row produce your harmony in this style.

Rather than a style you'd likely need some kind of new applet within BIAB to analyse your tone row (input as a melody) and calculate the three other versions of it.(inversion/ retrograde/ retrograde inversion) and make harmonies for each melody note based on this calculation.

Somehow I think you'd be best using Sibelius or Finale scoring programs for now!

Alan