Duplicate Flag Criteria in Fluid Expenses

With the new Autosave feature in Fluid Expense submission (reports auto-save after header portion is complete), we are concerned we will have many more duplicate flags as a user may close out of an expense report and not realize it saved then go back and start a new one. We believe the criteria used for flagging duplicates is "create date". Is there any consideration of using "submit date" to flag for duplicates? We feel this may help eliminate additional unnecessary duplicates caused by the auto-save.