Once I have the space set between lyric lines, I don’t really want to change it, so I’m always moving all lines in a system equally. I do a lot of vertical adjustment of lyric baselines.
Instead of having to select a lyric in every line before moving up/down, could perhaps something like Shift-Alt-up/down move all lyrics in that system up or down equally?
As a corollary to that request, perhaps Shift-Alt-Left/Right with one lyric selected could move all lyric lines that are at that rhythmic position.