Token.module Integration: Provide Token for Author Name

I'd like to be able to do automatic title generation for books using the book title (already in the page title) and the author name. Would it be easy to add a token to provide the author name?

From looking at the Token API docs (http://cvs.drupal.org/viewvc.py/drupal/contributions/modules/token/API.t...), it looks like the code for the token hook is as follows (a sample):

function my_user_token_values($type, $object = NULL, $options = array()) {
  if ($type == 'user') {
    $user = $object;
    $tokens['name']      = $user->name;
    $tokens['mail']      = $user->mail;
    return $tokens;
  }
}