Full text articles in the rss feed (i.e. without the more tag)

Ok, so it turns out that I needed to use the the_excerpt_rss filter and to modify the code so that it only applies to the R category I just added a is_category("R"). Below you can find the altered Full Text Feed plugin:

function ff_restore_text ($content) {
    if ( is_feed() & is_category("R")) {        
        global $post, $page, $pages;

        if ( !empty($post->post_password) ) { // if there's a password
            if ( stripslashes($_COOKIE['wp-postpass_'.COOKIEHASH]) != $post->post_password ) {  // and it doesn't match the cookie
                $content = get_the_password_form();
                return $content;
            }
        }

        if ( $page > count($pages) )
            $page = count($pages);

        $content = preg_replace('/<!--more(.*?)?-->/', '', $pages[$page-1]);
    }

    return $content;
}

add_filter('the_excerpt_rss', 'ff_restore_text');