It's very simple module that's adding [devel] tab on each /admin/store/orders/* page. Same as devel module does it on /node/* and /user/* pages.

If you have any idea for additional features then just submit issue with [feature request] category. Or if you have some bold idea with example ask for git access.

Drupal 6 version is sponsorship by ATD Travel Services

Drupal 7 version is contributed by Daffodil Software