Not sure which one turns the feature on or off exactly. An example:

• Equalized Mob Chances:
  • On modules.cfg:

    # Allows a mob wearing armor comparable to yours to rarely spawn
    B:tweak.equalizeMobChances=false
    

  • On modules.cfg:

    tweaks {
      # Causes some mobs to rarely! spawn wearing your armor on higher difficulty levels. [default: true]
      B:equalOpportunitiesForMobs=false
    
      # [...]
    }
    

Same happens with "zorro", for example. "Improved TNT" does this too, although the one on modules.cfg offers a little bit more options.

Never mind, that was dumb. Those were old config from before updating 0.4.0-alpha10, my bad! Did a regen of all config right before updating, so I forgot those might have changed :P