Demo isn't working for me :( . Dunno if destiny used it in the demo but I figured out how to get noclip and cheats. 1)Enable console in options menu 2)Bring down the console and type the command "spdevmap" 3)Have fun 8) . Noclip ect works pretty much the same except you cant use JUMP to go...
Maybe you could add a button in the server creation screen to start a map with devmap so you dont have to change all your settings and then have to type the map name in console.
Didn't watch the other ones but the last one on arnhem is definatly found. Arnhem15 I believe, you should check all the demos already on the site to see if its been done before you record and submit. Keep looking though .