Some notes to remember how to create a special functions in a plugin that can only be seen by a user with that role only.
Note this saves to the database, so add it in your plugin activation codes:
$result = add_role(
__( 'Fancy Role Name' ),
'my_custom_capacity' => true,
'read' => true
$role = get_role( 'administrator' );
$role->add_cap( 'my_custom_capacity' );
Note I also add it into admin role, this is so the admins will also be able to access this.
Then my menus look like this:
add_menu_page( 'Menu Name', 'Menu Name', 'my_custom_capacity', 'plugin_name/plugin_name.php', '', 'http://www.mysite.com/favicon.ico', 67 );