Bug 29449 removed userid from the OPAC self-reg form, but userid is still a selectable field in PatronSelfRegistrationBorrowerUnwantedField and PatronSelfRegistrationBorrowerMandatoryField. Selecting userid in PatronSelfRegistrationBorrowerMandatoryField quietly populates userid without an input box, and deselecting userid in PatronSelfRegistrationBorrowerUnwantedField doesn't display the field. The option should be removed from the syspref option if selecting/deselecting doesn't actually change behavior/form display.