I did cut the enemy saber_staff into half and become saber_dual ... Then, is there a way to break my own saber_staff to be saber_dual ???
Probably not. NPC's can behave a lot differently than your player does, like kicking with a single saber, and just look at how Alora fights. Most likely a mod will be made (like Forcemod II for JKA) that creates situations when you can lose a second saber, have one side of your staff disabled, or have it split in two.
you could bind a key to the commands.