Command + Option + Up/Down Arrow
Jump up/down systems
Option + Shift + Left/Right Arrow
Adjust spacing of note
Tab / Tab + Shift
Tab through objects in current staff … use to toggle Dynamic markings
Shift + Left/Right Arrow to select, then Option + Shift + Up/Down Arrow
Adjust verticle height of system
When adding a line, Option + Left Arrow
Selects entire line object for adjustment
Option + Shift + D
Filter out all dynamics and expressions (lines) in selection
Command + Shift + A
Select like elements in system i.e. select all text