[Richard Flynn]

Indeed, you don't need any special script—this was built-in from the time of the very latest sneaky-peeks. Perhaps it's not immediately obvious, perhaps it doesn't work the way you would want it to. However:

Select the items you want to sort: actions within a project selected from the main pane; projects selected from the sidebar; folders selected from the sidebar. Go to Edit > Sort > … and select which sorting criterion you want to apply. The options are By Name, By Status, By Date Added, By Date Completed. These options are only available if you've got a group of items already selected.