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The idea of a prisoner mod for race/personality has been suggested at various times and there's something to it. Maybe Undead or evil races get more prisoners or more militarily effective prisoners and Elves or "good" people get some kind of extra economic bonus from prisoners or can exchange them for gc or something.
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give a race or perso innate dungeon space in each acre or something
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Or just have different prisoner space per race? I think it's too small of a change to be of any effect.
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Something like Orc dungeons can hold more prisoners or Undead can sacrifice peasants and/or soldiers to fill dungeons (with some loss rate to make it costly enough that you don't have dudes with 20% full dungeons all the time).