There is no feedback of the other pilot‘s or AP‘s inputs. With the autopilot engaged the stick is locked in the centre position. If both pilots make inputs you will receive a „Dual Input“ aural alert, a flag on the PFD and in the HGS (if installed) as well an indication on the sidestick priority PBA in front of each pilot‘s nose. All in all pretty similar to the „real“ Airbus models. Dual inputs will be summed algebraically.
The thrust levers are moved by the A/T however cannot be momentarily overriden as on other aircraft. In this case it will simply disconnect.