[wilsonng]

Maybe you're looking for something that's just flagged only? Set the status filter to Flagged only. This should you any items that are flagged. Switch to Planning mode (Command-1). Then change Grouping filter to "Due" and Status filter to "Flagged".

Then you can collapse the subsections for "Due within the last...." (year, 3 months, month, week, etc.). At the end you can expand or show "No Due Date".

This should show all flagged items that have no due date.

Then you can select from the menu bar:

Perspectives > Save Window As... > New Perspective


Then you can optionally add it to your toolbar by control-clicking on the toolbar, Customize and then drag and drop your new perspective to the toolbar at the top of the window.