I suggest a new keybinding which does the following, say i map it to spacebar.
If i press spacebar while on the note column, it enters the last note i entered. If i’m on the volume column and press the space bar, it enters the last volume i entered, and so on.
The last note or the previous note above the current position? this is easy scriptable, the last inserted data is hard to script. Specially if you pasted clipboard contents.