The BT on/off setting is only missing if you switch through the options inside the settings menu using the remote (+/- buttons, </> to change the setting). When using the volume wheel to switch through the options, the BT on/off setting is there.
Yes ,but only to show the BT status. You can't change the status via remote. Only via hidden menu.
I think it's a good way to have it in a hidden menu. Most consumers will only turn it off once and this way they can't accidentally turn it on.