Spreading staffGroups across page

[Daniel Ashton]

I'm working with organ music, so three staves, of which the top two are 
in a StaffGroup.  This is with 1.6.8/cygwin or 1.6.5/redhat

let line = a set of measures in all staves
(What's a better word for line in this definition?)

I can understand that lily cannot squeeze another line onto the current 
page.  However, it leaves a fair amount of white space at the bottom of 
the page.  Is there a way to have lily dynamically spread the extra 
white space (or some of it) between the lines?

--
Daniel Ashton      PGP key available     http://Daniel.AshtonFam.org
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