If you are having typing issues with the new G74SX keyboard, I would recommend updating to ATK 1.0.00010. The issues with using the KB on the G74SX-3DE model I am testing here were fixed with this update.
You will need to uninstall the stock 1.0.0008 version, reboot, then install the 1.0.00010 package, and then reboot again.
BIOS allows for NumPad keys to function normally in games, and addresses lag and other abnormalities.
EDIT: I wanted to add that Shift + Numpad key toggles the key like NumLock. If you use a macro that ties Shift with a Numpad key, I suggest you use another binding.