Hi DJ77,
"The two controllers are springloaded to neutral, and are not mechanically coupled."
Yes. Which meant that when Captain moves his sidestick, there is no mechanical relation with F/O's position.
Hi PJ2,
On landing, the Flare Law introduces a slight ND tendency, against which the pilot must pull, naturally creating the flare manoeuvre.
How could this ND tendency be introduced if there was no way to change the pressure applied on the sidestick pitch axis?
My understanding is that sidesticks behave differently in auto mode and manual mode, hence will use different circuits. Documentation about those details is lacking in manuals (like many other details: find, for example, the detailed matrix of Airspeed, Alpha, etc; function monitoring).