So...due to 343 Industries being a fail of a company with config files and shit...this was found. I decided to poke the memory and it worked.
Mission Loading (Load any level you want)
All Skulls, All Terminals etc enabled
God Mode, Noclip, Screenshot, Free Cam, Third Person, First Person
and many others.
Video by me.
Menu found by iBotPeaches with assistance from Xerax, Deadcanadian and AMD.