Please do not misunderstand me gang, I do not really care what description one uses to define which pilot is which be it first officer or co-pilot or whatever.
Where I get annoyed is when someone gets all bent out of shape because they think it is important enough to make an issue out of it.
I'm really quite simple in my thoughts on the two crew cockpit.
I want my co-pilot / first officer to be better than me so I never have to worry about what would happen if I were to become incapacitated for some reason.
So I let them do as much flying as their little hearts desired, to hell with taking turns flying each leg, if they wanted to fly all of them I was quite content to let them with the understanding that I may take control should I ever need to......funny thing is I seldom if ever had to because they learn by doing, with calm and clear guidance when it starts to go out of shape.