Edit Window and Mix Window Keyboard Shortcuts : Event Menu

Event Menu
 
Option+1 (on numeric keypad)
Alt+1 (on numeric keypad)
Option+2 (on numeric keypad)
Alt+2 (on numeric keypad)
Option+3 (on numeric keypad)
Alt+3 (on numeric keypad)
Option+0 (on numeric keypad)
Alt+0 (on numeric keypad)
Change Duration (in Event Operations window)
Select/Split Notes (in Event Operations window)
Command+8 (on numeric keypad)
Ctrl+8 (on numeric keypad)