Add integration with Google Drive
A lot of apps are now integrating themselves with GDocs/GDrive. Files of any type can be saved to GDrive and when opened find the appropriate web application to open the file in and begin editing. All files in one place yet many applications. This would be very powerful and also touch on many of the other requests such as backups.
I am with you on that - Team Gantt are lagging behind Podio etc on this.