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
You can try to remove them temporarily from your community folder and see if it works then. Or maybe you can try to enter the same airport pair multiple times and see if the FMC is just a bit slow
The posts were not deleted, just moved to the correct subforum. This is the general section, not the A300 section. I will move this post as well.
For your issue, yes, this is a known issue, will likely be rectified in this weeks patch