Advanced Sorting option - numerical sort

We have a field “Project Number” which is a unique integer value, but some values are 5 digits and others 6 digits. It does not (and cannot) sort numerically. There are obviously many ways to sort, so I would like to see options to choose the sorting logic in the “Advanced Sorting” dialogue. For my purposes, numerical sort would be one I would like to see, but options for common sort logic would be welcome (man sort gives a good list).
*dictionary-order (currently the only method);
*numeric-sort (as aforementioned);