We do have a separate folder which could be configured to list all the long-standing papers in the journal from where the reminders could be sent to the overdue users as required.
However, consider the case of a journal which receives high volume of papers and many which are pending due to various reasons. In this scenario, it would be easier to select a list of papers which are pending in the same stage of the review process and then send a reminder to the overdue users for the selected manuscripts with a single click of the button, rather than to individually send the same reminder email repeatedly for each manuscript. Checkboxes next to a manuscript and a link such as 'Send Reminders' at the bottom of the page in the overdue papers folders could be included to implement this.
This would save a lot of time when streamlining the overdue papers in the journals and the time saved could be better used in other areas of the review process if implemented in ScholarOne.