ragged-last-bottom only affects last score in book

[Graham Percival]

Could ragged-last-bottom be changed to affect all scores in a book?  
Currently it only applies to the last one.  (even better: could this be 
alterable in separate scores?)


\paper {
 ragged-last-bottom = ##t
}

\score{
 \new GrandStaff <<
   \new Staff { \repeat unfold 80 {e'4 e' e' e'} }
   \new Staff { \repeat unfold 80 {c'4 c' c' c'} \bar "|." }
 >>
}

\score{
 \new GrandStaff <<
   \new Staff { \repeat unfold 80 {e''4 e'' e'' e''} }
   \new Staff { \repeat unfold 80 {c''4 c'' c'' c''} \bar "|." }
 >>
 \header {
   breakbefore = ##t
   piece = " "
 }
}