Omnifocus perspectives: "or" or "union" criteria

Is there any way to “or” filter criteria together?

I’d like to have a perspective that displays the First Available Action or any action that’s flagged.

Some other task managers allow the creation of boolean algebra statements for a little more sophisticated view management. Turns out I really miss that feature.

Thanks in advance.

Not possible directly. Never has been possible directly as far as I remember.

Extracting tasks that fulfill complex filter or search criteria can be done via AppleScript on the OF Pro Desktop version when you are so inclined.