Ability to manually or automatically archive folders that have not been modified for a while. The Archived files are searchable, but don't appear in normal file system (similar to how Gmail's archived emails don't show up in Inbox, but can be searched)
Archival of old BOX Folders.
It would be nice to have the option to archive/hide old folders. Creating a new folder to move them to is not ideal. Collections have helped, but being able to archive or hide folders from the default view would be even more beneficial for both Admins and users.