In Engrave mode > Staff Spacing, I can hold down Alt and ‘squish’ all the staves together when I move one of them.
However, I want to do the opposite: spread out a whole bunch of staves. Is there a way to just drag the bottom staff down and have all the ones above move proportionately?
That is a “one way only” functionality.
AFAIK, at the moment we can only Alt-squish. I believe that having the possibility to Alt-spread staves has been mentioned before and requested as a feature. I would also welcome this ability.
Ah yes, of course, ‘concertina dragging’. The term was on the tip of my tongue. 
