Alexair is correct, if we change it, other people will complain about it. If the default one isnt preferable to you, you'll have to move the camera yourself I'm afraid.
In theory you are right, however sometimes the A300 shows it age and it just ignores it and plays the sound regardless.
Virtually all operators have the "DH -5" in their SOP to stop the sound from playing.
As for the first issue, you can try this:
We will add deadzones around the set points in the next version, that should remove those issues.
Which tiller axis? From my knowledge, there is only a "Nose Wheel Steering Axis", but that works as expected for me