I have the Airbus TCA Quadrant too.
Through comparison with FS2020, seems like this:
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Simple throttle axis (Throttle 1 axis) binding works if you need a simple curve that doesn’t account for the neutral in the middle by default, in other words, it doesn’t have a negative part.
This works well with aircraft that have a throttle calibration, because you can then decide what will be the “virtual” idle, and the part of the curve below will be considered negative. It also works for GA aircraft without reverse, as you can free the physical idle detent on the quadrant to use all the lever movement as forward throttle. -
Throttle axis (0 - 100%) should provide a curve where the neutral point is accounted for by default, and the part of the curve below should be read by the simulator as negative or “reverse”. This is for default aircraft with reversers, that don’t have built-in throttle calibration. You should adjust the neutral point (in controls → TA320 Quadrant → hardware settings) so that, when physical levers are in idle detend, the throttle levers in your aircraft are also in idle.
Now, the bug is: FS2024 doesn’t read the negative part of the movement with Throttle axis (0 - 100%), so, even if you manage to adjust the neutral point (hard to do since the dot doesn’t move with throttle in the hardware settings), you are stuck without reverse in default aircraft as the 737 MAX.
Moreover, I can confirm that adjusting sensitivity has no effect at all on response curve.