On controller: Leaning & free-look as tank commander

Has anyone an idea how to bind leaning to the controller without screwing anything else up? I tried a couple of possibilites (d-pad left/right, with and without activation button), but so far I couldn’t figure out something that works well with all the other bindings.

Also, when playing as tank commander looking out of the hatch, free-look ((RB + right stick) does not work for me. Is this intended or a bug?