Space between systems with lilypond-book

[Nils]

Hello list,

since lilypond-book makes an image of each staff-system and places them as 
normale TeX lines all spacing between the systems vanishes, which looks ugly.

This was discusses already here: 
http://old.nabble.com/system-system-spacing-in-lilypond-book-file-td31930124.html
and the solution is not bad. But it is too static.

When you have systems which have enough space naturally (through a single very 
low note or figured bass) this method results in too much space.
I also use markup-lines after the score for a subtext. The LaTeX line-spacing 
also applies to these text lines so that is looks even worse.

Is there a way to tell lilypond to use a minimum height for a staffgroup but 
not with extra space under the system but within the system so that it gets 
exported correctly for lilypond-book? I thought of a low, hidden note here and 
there in my lowest staff, but maybe there is a better way?


Nils