Theme Username for yname in Forward Form

Could the $form['message']['yname']['#deafult_value'] in the forward form,
use the theme('username', $user) instead of just adding the $user->name as the default value.

That would allow to override the default name. Its easy to override the form by using the hook form alter, but i also see that other core modules as the comment module uses this as std, when themeing the name.