Ive noticed that some differentials get accepted, but are generally not ready to land and are marked as such with "[Later]" (or similar) in the title.
I wonder if it would be worth making this concept a little bit more concrete (i.e. treating it different in the UI). A couple of cases which come to mind as preconditions for a differential being landed are:
* After another differential has been landed (dependent).
* After a maniphest is closed.
* After a given time period has elapsed.