With 1.2.17, you could actually set the spacing using 
minVerticalAlign. Try the following example:

---------------------------------------
music = \notes \relative c{
  \clef "bass";
  g4 g g g
}

\score {
   <
      \context ChoirStaff = choir1 <
         \context Staff ="cantus1" <
            \music
         >
         \context Staff ="altus1" <
            \music
         >
         \context Staff = "tenor1" <
            \music
         >
         \context Staff = "bassus1" <
            \music
         >
      >

      \context ChoirStaff = choir2 <
         \context Staff ="cantus2" <
            \music
          >
          \context Staff ="altus2" <
             \music
          >
          \context Staff = "tenor2" <
             \music
          >
          \context Staff = "bassus2" <
             \music
          >
      >
   >
   \paper{
      \translator{\ScoreContext
         minVerticalAlign = 50;}}
}
------------------------------------------

     /Mats

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