This is a pretty interesting subject from a Human Factors/CRM stand point.
In my old CRM class we would shoot approaches with the FP (flying pilot) just doing all the flying and then the landing. NFP would handle navigation, comms, checklists, etc, and have his head outside the plane on approaches.
Note, this was all in a sim. The flights we actually had (in a light twin) all ended up being VFR and we just shot visuals.