Operator has time in activity log but "actuals" not in my admin screen

Nigel at Mehrtens has reported repeated instances of an operator starting/finishing a job(can see time in the activity log) and no actual size or hrs on the admin view.

This occurs when the operator hits 'confirm actuals' without making a entry on the screen or navigates away ( selects the back arrow at the top...looses connection) at that point.

In the example below if I hit confirm actuals it will log the size as 200 but the time as 0.00 as there are no hours entered.

Is there a way we can provide a back-up mechanism or alert that says youve not entered any hours are you sure you want to confirm or leave this page? (or similar)