Quick suggestion unless I’ve missed something. It would be helpful to be able to shift multiple columns in the same action. For example, if I want to shift columns 1, 2, and 3 each up one row, this requires 3 actions. Would it be possible to add an option to the “Shift column up/down” action that would allow you to select multiple columns to shift?
The way I ended up doing it is specific to my situation: I had a table of 5 columns, for 3 of which I wanted the previous and next line's value. I added a UID, split the table three ways: one plain, one with the UID shifted up, one with the UID shifted down, and then merged them back in.
... and then I saw that it too more actions and longer to do it this way than the 6 "Shift up/down" actions I'd have needed, so I changed it back.