Its just a simple script to turn off touch key light (the 2 touch key on left and right of your home button)
It save battery when the light is off-forever

It can be turn on again when u remove the script...
I'm not a dev, so i just share here the script without cwm zip, i try to make a flashable zip but i cant change the permission...it always goes rwx--r--r when i flash it...sorry
Here the script ->
http://db.tt/b0iEOLkW
Copy it to system/etc/init.d folder then set permission to rwxr-xr-r
Then reboot!
Done! No more back light on the 2 button...like iphone

(if u admire iphone)
regards,
•ƒγяύs ργяσ™•