On the herc captains can fly from either seat if they maintain their RHS currency. The Aircraft Captain is, however, still the bloke sat in the LHS. Instructors etc get a separate qualification to operate as Aircraft Captain from the RHS.
As for training abo copilots to operate from the LHS......don't get me started
what a pointless exercise. If we have to save money on our core business (er, flying) there are better and more constructive ways of doing it than this sort of half arsed tosh.