Captains need to set a pace that works for the crew. If they are flying with a slower first officer it doesn't speed things up to rush them. There are times to be heads down such as when you are creeping on the last taxi wayleading to the runway. Pulling off at the end is complicated since ATC plans for you to be ready. If things are unusual and you need more time ask to be sidelined earlier. Especially when you are destined to a busy airport early communication keeps the operation smooth. Lots of times I watch crews behave as if the airport is theirs personally and they are the most important thing out there. I for one definatley think that once you start the push your tasks should be streamlined so "Aviate" stays the primary concern and you follow the right aircraft and taxi in the right piece of pavement.