I have the same situation. I know that before I changed the BIOS from A06 to A05 I could adjust more, like USB BIOS Legacy Support, Bluetooth and Boot Order. I didn't really try much more. Now all those options are not selectable. I didn't worry about it because everything seems to work fine. I just figured they weren't an option in A05. I bought my 10v new, should I upgrade the BIOS back to A06, restore the computer to factory again and contact Dell? Will I need these BIOS options in the future and is it affecting anything else I'm not noticing?
BTW... I'm not sure if it was just the BIOS downgrade or the whole triple boot install. I didn't check in between. Just when I first received it and when I was done. I noticed it when I was trying to fix the sleep issue and turn off USB Legacy support.