Working Week

Hi Team
Now that we have the first type of dependencies working I believe defining the working week would be of great benefit. Most circumstances will be solved by being able to choose 7 days a week or 5 days a week but the best solution would be a quick select of 5 or 7 days with an ability to modify individual days for holidays or any other reason for a non working day.
What do people think?
Regards
Peter