Bolty McBolt & Short Circuit:
My previous comments were from the top of my head !!
I think you may be correct, I think the L & R sensors provide respective Cpt / Fo indications & in the event of either failing the other will provide data on the B744.
As for config warning I think SS is correct, any of the sensors will provide the config warning via the EIU. Older Boeings like 757 I think it's the centre only.
I havent flown a B744 for some time, but is it possible to get an unscheduled trim movement that would cause a takeoff config warning?
MC