Shared Rests

[Dan Eble]

Can anyone offer general architectural advice for adding the option for parts 
on the same staff to share rests when possible?  I mean without using 
\partcombine.  I’d like to focus on multi-measure rests first.  Roughly, I 
guess there should be something that watches for notes and rests in all voices, 
and if there are only multi-measure rests in the current measure, eliminate all 
but one MultiMeasureRest grob (or eliminate them all and create a new one?).  
Would that be a new kind of engraver placed at staff level that works 
independent of the multi-measure rest engraver, which remains at voice level?  
Are there engravers that work similarly that I should study?

TIA
— 
Dan