I made this file months ago, and it's worked on every TW rom I've had, since I HATE the backwards button layout Samsung chose. Download this file, go to your /system/usr/keylayout folder, rename your existing sec_touchkey.kl to sec_touchkey.kl.bak, then move the file I gave you into that folder. Set permissions and reboot, and you'll have the setup you want.
Obviously, just turn the backlights off in the Display settings. Do note that you won't have a menu button after you do this, I just use Button Savior to put a little shortcut off to the side. But if you come up with a more elegant solution, please feel free to let me know.
That file should do what you want, all I ask is that you credit me if you share it with anyone, put it in a rom, or whatever.
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