[wp-hackers] Inconsistency between the category edit form and the category add form

[Andrew Nacin]

>
> In the former (in edit-category-form.php), there is an action hook
> (edit_category_form_fields) that allows for the addition of extra fields to
> the form.  These can then be handled by update_terms action hook in
> update_term.  The edit_category_form_fields action, however, is not present
> in the category add form (in categories.php).
>

This has been previously suggested. Please see
http://core.trac.wordpress.org/ticket/11285 and comment there -- a core
developer is looking for an example plugin to implement this.