Enabled the Multiplayer in SP Demo
Well I've been digging some more and I couldn't find any more extra ending stuff, so figured out how to enable multiplayer option in the sp demo.
All you have to do is move the Z_UI_SPDEMO.pak out of the Crysis SP Demo\Game directory. Just save it in a back up directory and then run the demo. Mutliplayer is now an option you can select.
I'll investigate more tomorrow, maybe we can play some lan games.