Flat slope on selected weekdays
Assume someone does not want to make progress on work-related goals on Sunday.
Current approach: Let that person build up a buffer from Monday to Saturday.
Problem: True akrasians won't do this. On Monday to Saturday, they will just make enough progress every day to not derail. So the lack of flat sections in the slope (if they are not manually inserted 7 days in advance) encourages truly acratic users to work every day.
One possible solution: Add an option to make the slope flat on selected days of the week.