Whether on GR4, E3 or any aircraft with navigators, putting a pilot in their seat could be beneficial. Having a flexible system whereby a guy can turn up for work and be programmed to fly in either seat is not only good for increasing awareness of the aircraft systems but could also mean that anyone could do each job and therefore increase crew availability. This could mean a net decrease in the number of personnel and the abolition of an entire training system.
I'm just amazed we haven't done it sooner!
BV
PS. While we're discussing flying pay on other threads is it sensible to pay pilots and navigators the same?