This plugin adds a "Basename" input field to the category / folder admin screen's "Add new.." form.
Enter the "Category Name" and then hit Enter to move the cursor to the "Basename" field. Enter a name, push enter, and the changes will be reflected in the list. If the Basename field is left blank, a default name will be automatically generated.
Sub-category fields are also supported.
Movable Type versions: 5.05.15.26.0