UEFI Bios modding to reveal hidden menus?

[thanatos2k]

I've got an Asus Rampage IV extreme with the X79 chipset, I'd like to mod it so I can pick which PCI-E slot it looks at at POST for video. I've seen menus on my gigabyte boards (though only ones with integrated video now that I think about it) that let me pick Integrated, PCI-E slot 1, PCI-E slot 3, etc for the default. Is that something I might be able to accomplish with a bios edit for the Asus board (no onboard video)? I remember revealing hidden menus on old AMI and Award bios back in the day, long before UEFI came about, but I've not done it in years.