Hello,
this is not a Frescobaldi but a LilyPond question.
Writing "s" instead of "r" will produce "spacer rests" which do exactly
what you want.
Well, mostly. What is still lacking to be done automatically is moving
the remaining visible rest to a default center position.
For this you have to write \oneVoice before the visible rest and
\voiceXXX afterwards, when there are two rests again.
HTH
Urs
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