Jason,
I have a 751 so not sure if this will work with yours, it annoyed me as well the keyboard timing out and not on at boot. I know with my 750 jx the problem arose with an AKT driver update, I went back to the old driver and no problems. With the 751 I uninstalled the ATK package driver and the keyboard doesn't timeout and comes on when the ROG logo comes on at boot.