Being able to say, this Task can only finish on a Tuesday or the 15th day of the month. We have a Medical Legal Review process we have to do and it can only be at certain times of the month.
Plus one. We have a weekly meeting on a Friday that needs to be a task within a project, different people are assigned to attend each week depending on which projects are active that week. Would love to be able to calculate to a specific day of week.