Permalink doesn't update when hiding the slug metabox

Hello,

Currently using WordPress 3.4-alpha-19620 it seems it isn’t possible to edit the post/page/post-type permalink when hiding the slug metabox.

/**
 * remove_post_meta_box
 */
function remove_post_meta_box() {
	remove_meta_box('slugdiv', 'post', 'normal');
}
add_action('admin_menu', 'remove_post_meta_box');

/**
 * remove_page_meta_box
 */
function remove_page_meta_box() {
	remove_meta_box('slugdiv', 'page', 'normal');
}
add_action('admin_menu', 'remove_page_meta_box');

Assuming this isn’t how it’s suppose to be, would someone know perhaps a solution for this?
I’ve tried to give it a lower priority, but unfortunately didn’t work either.