Add setting in hook_cronapi to make cron disabled by default

Can you add a setting in hook_cronapi to make cron disabled par default. I've found no way to do this. For example, i want to disable standard cron when my module is enabled.

function mymodule_cronapi() {
  $items['mymodule_cron'] = array(
    'description' => "Standard cron",
    'disabled' => true,
  );
  return $items;
}