Custom CRM Lead Statuses Can't be Filtered

When you make a custom lead status for CRM in the "Reference Books" settings, you can not filter by that status on your leads page. You can only filter by the default statuses: NEW, ATTEMPTING TO CONTACT, QUALIFIED, & DISQUALIFIED. 

When you add a customer status to one of the leads it would be very helpful to be able to filter by this new status. See picture for example. Please considering adding this feature.