Mats -
Now, in \time 2/4,
r2 produces a horizontally off-center rest,
R2 produces a horizontally centered rest,
c2\rest produces a horizontally off-center rest, vertically positioned
at the position of note "c".
Controlling a horizontally centered rest with a specified vertical
position can be accomplished with:
\override MultiMeasureRest #'staff-position = #-1 R2
Would it be a reasonable feature request to ask that the dual control be
simplified to
c2\Rest
using the note position for vertical control, and \Rest with a capital
"R" to designate horizontal centering? This would only apply to whole-
and multi-measure rests.
If you agree, please forward to lilypond-devel.