Improvement of scheduling activities by duration

If you schedule an activity using the duration (e.g. 5 days), all standard tools will take into account calendar, i.e. if you schedule activity from Wed, it will finish by next Thu.
In case of PP, it will schedule it to finish by Monday, not taking into account the weekend. This is quite different comparing to the common standards that normally take into account weekends, holidays and vacation schedule (if entered, of course).