Is it possible to have the percentage complete column show as progress bars or even as a little Gantt chart?
Expand right pane until you can see the column titles. Then right click on the titles and select Field Choose. Drag % complete onto the Tasks.
However, it only appears when the task bar is of a certain width, regardless of how many columns are visible.
So, what you can do is group by % which may be OK. Right click in the pane and select view settings. Then click Group By and select % Complete. You can select multiple Group By so you can still have the due date first, and then % complete as a subset.