Maybe someone who knows a bit more or notices something I did not can help... I was looking in literally every folder for the file that controls the soft keys. This is a script I wrote up that *should* disable them but they turn off and come back on when you tap them.
#!/system/bin/sh
chown root /sys/devices/virtual/sec/t_key/brightness
chmod 0777 /sys/devices/virtual/sec/t_key/brightness
echo 0 > /sys/devices/virtual/sec/t_key/brightness
chmod 0555 /sys/devices/virtual/sec/t_key/brightness
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#!/system/bin/sh
chown root /sys/devices/virtual/sec/t_key/brightness
chmod 0777 /sys/devices/virtual/sec/t_key/brightness
echo 0 > /sys/devices/virtual/sec/t_key/brightness
chmod 0555 /sys/devices/virtual/sec/t_key/brightness
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