Enabling SASL authentication mechanisms in openLDAP using OLC

All of the information that I have been able to find about enabling SASL mechanisms for openldap still use the slapd.conf method while all modern LDAP directories have elected to use OLC over a static file. Does anyone have information on how to add the saslHost paramaters to the OLC directory? It also seems like I have more SASL mechanisms locally than I do through the frontend. How can I enable **plain** authentication via the frontend? scadmin@ubuntu1604:~$ ldapsearch -x -H ldapi:/// -b "" -LLL -s base supportedSASLMechanisms dn: supportedSASLMechanisms: DIGEST-MD5 supportedSASLMechanisms: EXTERNAL supportedSASLMechanisms: CRAM-MD5 supportedSASLMechanisms: NTLM supportedSASLMechanisms: PLAIN supportedSASLMechanisms: LOGIN scadmin@ubuntu1604:~$ ldapsearch -x -H ldap://127.0.0.1 -b "" -LLL -s base supportedSASLMechanisms dn: supportedSASLMechanisms: DIGEST-MD5 supportedSASLMechanisms: CRAM-MD5 supportedSASLMechanisms: NTLM scadmin@ubuntu1604:~$