Wouldn't it be usful to be able to specify an avent date/time as the due date for an assignment? E.g. when students need to read something before a lecture or hand in the asignment before 1 day before a workshop. Currently, you achieve this by specifying the date of the lecture and specifying the due date for the assignment separately. If the lecture date changes, you need to adjust both of them separately (and not forget that the change of the event date implies a changed deadline!). If you could simply specify the start date of the event (or start date minus 1 day) as the deadline, that would be taken care of automagically.
Has this ever been discussed?