Admins can't submit a recurring payment if billing fields are disabled

The billing fields are disabled by default, which is fine in general, but it seems that when billing fields are disabled the administrative interface for submitting a credit card payment will not allow a recurring option for some reason.

See: https://civicrm.stackexchange.com/questions/40224/how-to-add-a-new-recurring-contribution-from-the-administrative-side