Shock has found the Address in game that changes the Games "Engine Mode" Which you can use to enable the SP Engine in MP.



Engine Address

30001758 = 1 Byte
Campaign = 1,
Multiplayer = 2,
Mainmenu = 3,
Shared = 4,
SinglePlayerShared = 5,
unknown = 0



Difficulty

300019F2 = 1 Byte
0 = Easy
1 = Normal
2 = Heroic
3 = Legendary



Co-op enabled

300019F4 = 1 byte
0 = Off
1 = On