Comment #12 on issue 1263 by [email protected]: MetronomeMark can not be aligned on note if MMR in another voice
http://code.google.com/p/lilypond/issues/detail?id=1263
I am also in favor of aligning the tempo indication on the "equivalent" of the first note X-position, even if the upper Staff has a MMR (and even if there is only one Staff if possible). By doing this, this would solve also issue 712 (IIUC comment 5 by Werner).
