Shimmie2

FILE ext/tag_edit/main.php
On line 18 add

/*
 * AuthorSetEvent:
 *   $image_id
 *   $author
 *
 */
class AuthorSetEvent extends Event {
    var $image;
    var $author;

    public function AuthorSetEvent(Image $image, $author) {
        $this->image = $image;
        $this->author = $author;
    }
}

between line 59 and 60 add

if($this->can_author()) {
    send_event(new AuthorSetEvent($event->image, $_POST['tag_edit__author']));
}

on line 73 add

if($event instanceof AuthorSetEvent) {
    $event->image->set_author($event->author);
}

find

if($event instanceof ImageInfoBoxBuildingEvent) {
            if($config->get_bool("tag_edit_anon") || !$user->is_anonymous()) {
                $event->add_part($this->theme->get_tag_editor_html($event->image), 40);
            }
            if($config->get_bool("source_edit_anon") || !$user->is_anonymous()) {
                $event->add_part($this->theme->get_source_editor_html($event->image), 41);
            }
        }

and replace with

if($event instanceof ImageInfoBoxBuildingEvent) {
            if($config->get_bool("tag_edit_anon") || !$user->is_anonymous()) {
                if($config->get_bool("tag_edit_enable")){
                    $event->add_part($this->theme->get_tag_editor_html($event->image), 40);
                }
            }
            if($config->get_bool("source_edit_anon") || !$user->is_anonymous()) {
                if($config->get_bool("source_edit_enable")){
                    $event->add_part($this->theme->get_source_editor_html($event->image), 41);
                }
            }
            if($config->get_bool("author_edit_anon") || !$user->is_anonymous()) {
                if($config->get_bool("author_edit_enable")){
                    $event->add_part($this->theme->get_author_editor_html($event->image), 42);
                }
            }
        }

find

if($event instanceof SetupBuildingEvent) {
            $sb = new SetupBlock("Tag Editing");
            $sb->add_bool_option("tag_edit_anon", "Allow anonymous tag editing: ");
            $sb->add_bool_option("source_edit_anon", "<br>Allow anonymous source editing: ");
            $event->panel->add_block($sb);
        }

and replace with

if($event instanceof SetupBuildingEvent) {
            $sb = new SetupBlock("Tag Editing");
            $sb->add_bool_option("tag_edit_enable", "<br>Enable tag editing box: ");
            $sb->add_bool_option("source_edit_enable", "<br>Enable source editing box: ");
            $sb->add_bool_option("author_edit_enable", "<br>Enable author editing box: ");

            $sb->add_bool_option("tag_edit_anon", "<hr>Allow anonymous tag editing: ");
            $sb->add_bool_option("source_edit_anon", "<br>Allow anonymous source editing: ");
            $sb->add_bool_option("author_edit_anon", "<br>Allow anonymous author editing: ");
            $event->panel->add_block($sb);
        }

FILE ext/tag_edit/theme.php
find

    return "<tr><td width='50px'>Tags</td><td width='300px'><input type='text' name='tag_edit__tags' value='$h_tags'></td></tr>";

and replace with

    return "<tr><td>Tags</td><td><input class='editor_tags' type='text' name='tag_edit__tags' value='$h_tags'></td></tr>";

between line 29 and line 30 add

public function get_author_editor_html(Image $image) {
    $h_author = html_escape($image->get_author());
    return "<tr><td>Author</td><td><input class='editor_author' type='text' name='tag_edit__author' value='$h_author'></td></tr>";
}

FILE core/imageboard.pack.php
on line 363 add

    public function get_author() {
        return $this->author;
    }

    public function set_author($author) {
        global $database;
        if(empty($author)) $author = null;
        $database->execute("UPDATE images SET author=? WHERE id=?", array($author, $this->id));
    }

SQL

ALTER TABLE 'images' ADD 'author' VARCHAR( 255 ) NULL DEFAULT NULL AFTER 'source'

Check and add class to editor fields.

class='editor_tags'
class='editor_source'
class='editor_author'