How would I increase the Author Role to be able to add a new category?

How do I increase Author Role permissions to be able to add Categories?

Other solutions welcome. We just need guest authors to be able to add categories while ensuring there is not already a existing appropriate category.

Answers:

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Method 1

The easiest way is to use a plugin like Capability Manager or User Role Editor

Method 2

Should work from inside your functions.php

function add_manage_cat_to_author_role() 
{
    if ( ! current_user_can( 'author' ) )
        return;

    // here you should check if the role already has_cap already and if so, abort/return;

    if ( current_user_can( 'author' ) ) 
    {
        $GLOBALS['wp_roles']->add_cap( 'author','manage_categories' );
    }
}
add_action( 'admin_init', 'add_manage_cat_to_author_role', 10, 0 );

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