HOW TO PLACE VERTICALLY CENTERED RESTS ?

[MX]

-) The whole measure rests in the last system are not centered inside the
> >measure (measures 109-111 and 115.


> Use R2 instead of r2. In general, always use R for full measure rests, see
> http://lilypond.org/doc/v2.4/Documentation/user/out-www/lilypond/Rests.html
> #Rests


Yes but, how to shift vertically centered rests with an a1\rest - like instruction ? 

> > with : \once \override MultiMeasureRest #'extra-offset = #'(0 . 1)  R1 for 
> > example.

Yes but, what if you want the rest outside a stave, for example above ? The 
rest will be printed wittout the little line. How to proceed ?

MX