How do I disable the backlighting for the menu and back buttons on a Galaxy SIII? Does anyone know how to disable the lights of the buttons at the bottom of my phone?
They are really annoying and I can reach them without the lights on.
I've tried several apps but none of them worked.

I have a custom ROM and I'm rooted. This ROM doesn't show any option for my issue. I don't want to change my ROM because I really fell in love with it.
GravityBox module for Xposed Framework can do it. Xposed requires root, but from reading your question, it looks like you have root.


Download KitKat
Download Jellybean


From the XDA Thread:


  
  Button backlight modes (default, disabled, always on while screen is on)