Actually the command console is there. It's just hidden away. For those interested in getting the console back as it was in the previous games, take a look here:
www.ultimate-filez.com/
(MW2 Unleashed)
Whether or not there is a CVAR to toggle third-person I don't know. But you'll soon find out.
And when I have to go online with Steam, as I occasionally do, it'll undo the mod.
Hence, no console. The developers intentionally removed it so that people couldn't easily test mods on their precious piece of crap game.