\tempo over multimeasure rests (again)

[Paul Scott]

Hi,

I'm asking again about my most challenging cosmetic problem with Lily:
How can I create/place tempo indications in a score/parts so that the 
instruments that have multi-measure rests at that point in the music 
have the tempo indications left justified like the parts which have 
notes at that point?

Certainly we expect the MMR number to be centered but not tempo 
indications.  ISTM there needs to be a simple way to left justify text 
over MMR's.  My current work-around is to use \mark and roll my own 
rehearsal marks into the tempo indication.

Thanks for any thoughts.

Paul Scott