I always assume that most drivers are coming in on the same lap. So I either go one lap longer or one lap shorter, to help prevent being delayed by the lollipop man.
What has annoyed me since F1 2010, is that when you have minimum wing damage, not effecting your race, they still change the frigging nose, and delay the pit stop.
A simple option in the pit lane, when the driver has nothing to do is ask the question. Change Damaged Nose? Yes/No
Otherwise most pit stops are in the region of 3 seconds .... which is fine