Possibility to split master window

[cnekmp]

IEverything is working as expected. But I'm missing the feature that master stack cannot be split as the other stacks do. Is it possible to achieve a complete grid layout like whole evenly split windows?

My config:

plugin {
  nstack {
    layout {
      orientation=left
      new_on_top=0
      new_is_master=0
      no_gaps_when_only=-1
      special_scale_factor=0
      inherit_fullscreen=1
      stacks=4
      center_single_master=0
      mfact=0
      single_mfact=0
      orientationvcenter = bottom
    }
  }
}