I keep coming back to Wunderlist to see what's new and this is the one missing feature that keeps me from embracing it.
To expand upon this idea, I want this feature so it's easier to focus on today. Perhaps I scheduled too many tasks for today. Upon reviewing them in the morning, I want a quick method for postponing a large number of them.
ios needs this option. Any.do and todoist both have this option. It save so much time.
I will also add (or second others above) - "occur after completion"