What you are suggesting is an interconnection with both SS (Bus bar or by Electric synchronisation) and in abnormal situations you want to disconnect this synch.
A lot of engineering ahead for a feature which will be of -no use- most of the time.
The same could be said for Stall Warning and a lot of other basic items that are required by regulation on a normal airliner.
There is a visual indication of resultant SS inputs on PFD on ground.
Lotta' good that does at FL 350.
The yoke in your gut on a normal airliner tells you the other pilot is pulling hard. You don't have to look at a display or at his hand, or a Trim in Motion alert. Does the A330 have a Trim in Motion alert?