Auto-save enhancement

[WayneMokane]

It would be really helpful if the auto-save feature under Preferences/Backup could be more customizable. Namely, it would be nice if there was an option for "except not-yet-saved files". So many times I just use one "document" as a scratch pad, and don't want to save it, but the auto-save keeps interrupting me. However, it still is a very important feature and I appreciate it when working with already saved files. Is there any way to add this simple option? Thanks.