Comment #9 on issue 2445 by [email protected]: Center a number above a measure
http://code.google.com/p/lilypond/issues/detail?id=2445
@David N: You could also have a look at submitting your work as a snippet, in the LSR. That might be easier than adding a new engraver to the internals. The CG in Section 7 will get you started.
