I had high hopes for the new Batch Edit feature on the assignments page.  It's smart enough to know when an assignment has multiple due dates associated with different student groups (example:  a student has an extension but the rest of the class is using the default).  The downside is that it doesn't give you the ability to configure that.  What happens in most cases is that you need to change many different assignments for a student who has requested an extension.  So, I would request the ability to add a single student or group of students as an exception date via the batch.  It seems like, just being able to select a student or group on the batch screen would accomplish this.