There are operators who are so hung up on strict interpretation of SOP (areas of responsibilities etc) that there are first officers with thousands of hours on type who have never cut the engines at the end of a trip. With regards to allowing F/O's to taxi the aircraft even on straight taxiways using rudder pedal steering, there are some culture deficient captains who are pedantic fools. Unfortunately the F/O has to grit his teeth and wear it.