If use without track ir i use the xbox controller for this successfully but you have to train yourself using it.
I describe here
For in this way you can do exactly this what ir track does,
I recommend that you bring back freelook speed and zoom speed because i think they are in need of each other in like a factorscale way.
Hope this can help u and i think Asobo is trying to get off the beaten path and l learn us a new way.
I think also this way is more stable to use the mouse for clicking than when ir track when it feels wobbly because head movement always happen while the xbox controller stops as you let go of the inputs