A new tool has been added, elive-keyboard-backlight:
~ ❯❯❯ elive-keyboard-backlight
Usage: elive-keyboard-backlight up|down|toggle|toggle_full|get|set|info|max [value|steps]
examples:
elive-keyboard-backlight get
elive-keyboard-backlight set 50%
elive-keyboard-backlight toggle 4 (toggle the light in steps of 4)
elive-keyboard-backlight toggle_full
Try it and if it works with your backlight of the keyboard you can add it now to your desired desktop hotkeys 
scite ~/.e16/bindings.cfg