I designed a simple app that disables the backlight for the capacitive keys. It also installs an init.d script that disables them at each boot, meaning you can uninstall this app after using it, if you wish.
Perfect for roms that have a navbar but no option to disable the button lights, or anyone who doesn't need the glow to tell you where your buttons are.
I tested this on SkimKat. I'd like to know if it works on JB roms.
Edit: I noticed that the screenshots make it look like a widget. This is definitely not a widget, but an app overlaying the home screen. In other news: I'm accepting better screenshots (I don't own this device)
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