Ping Federate connector to automatically sign people out of all apps when deprovisioning
Use the API call "Update User" to force a user to change password (and in doing so, log them out of all applications) when deprovisioning a user using outbound provisioning. This isn't necessary if users are being deprovisioned to "Deleted" or "Inactive" status, but if they are being set to "Cannot Delete, Edit & Upload", then the user will still have access to Box via Sync/Mobile clients
This suggestion is not under consideration for the future roadmap. We are currently focused on improving our user interface and key flows of user management before we add enhancements to the de-provisioning process.