add -x days to the query filter.
I have many overdue task but most of the time I want to see only the last few days. (I dedicate a specific timeslot to task that are long overdue).
Adding, something like "-5" to see the 5 previous days would be very helpful. "+5" is already there. So it is a natural extension from an user perspective and is likely to be very easy to implement (the parsing is almost the same as the "+5" query).