DCS World support EDTracker natively (ie. joystick headlook) as well as via Opentrack if you wish. One of ours users, Boris, reported :-
"I just used the device without any emulation software. I used the built in axes preferences of dcs world to assign the joystick (ed tracker) to the head movement in x- and y directions.
The lack of sideways movements is absolutely tolerable because you wouldn't need them at all: I have track ir and I always recenter when I sat "offseat" sideways. For zoom I use a keyboard command, zoom was way too uncomfortable when using track ir (to look down at the flight computer you would have to move the head right downwards and towards the monitor and your eyes would nearly fall out then)."