@EskeRahn, thanks for your reply. I saw this option and i would use Key Mapper (For example) to trigger (Left Ctrl + *) to switch Off/On the backlit when opened. No way for the moment. The only way i found (for now) is to set an Action via Nova Launcher to directly access in "Buttons" section. So i would like something more precise 😄
Edit: I will NOT ask to @Slion if something could be done.
@FlyingAntero, thanks for your reply too. I will take a look more deeply in Key Mapper cause i don't really what are the possibilities with it.