Allow WMS orders screen to filter by ETD and include past dates

We use WMS with a filter on the order ETD so that the warehouse team can see what orders are due our today.  However sometimes they can't fulfil a specific order by the end of the day in question, whether this be because there is insufficient stock or just not enough time for example).  When they come to the same screen the following day the order in question will no longer display under the same filter unless someone edits the order to change its ETD.  It would be really helpful if the ETD filter would allow us to use the “days before” dropdown in addition to the “days after” dropdown so that any backorders are still visible.