Since in CoD Gs will influence the players head movement and targeting, the player will have to compesate the Gs moving the head this will be a major disadvantage for ones without headtracking. Maybe you can use the mouse interface to FreeTrack, 2 axis of movement (3 if you count the mouse scroll). If CoD use multiple joystick interface FreeTrack can use it too. FT just have to use criativity. The man ll be never slave if he uses the power of mind.
No way i ll buy CoD if i can not use any HT option, since i ll not play to be a targeting drone.