Filter By Incident Flag

Our invoicing process involves the student and department technicians marking certain incidents as "Needs Invoiced" using a custom flag on the incident. I then review all incidents with the "Needs Invoiced" to do the actually invoicing and then remove that flag when it's completed.

This process actually works well, but it would be nice if I could filter the incidents (or do an advanced search) that only shows me incidents with this specific flag. Because at this point it's just a visual eye-ball search and my old eyes tend to miss a couple.