does not allow the ability to add a username right?

How can one get

if (OriginAuthorization.user) {
const auto savedPassword = OriginAuthorization.password;
if (pathPassword)
OriginAuthorization.password = pathPassword;
OriginAuthorization.commit(msg);
OriginAuthorization.password = savedPassword; // restore the global password setting
}

to function without the username to go with cachemgr_passwd now?

It would require both now

        if (ProxyAuthorization.password && !ProxyAuthorization.user) {
            std::cerr << "ERROR: Proxy authentication password (-w) is given, but username (-u) is missing\n";
            exit(EXIT_FAILURE);
        }
        if (OriginAuthorization.password && !OriginAuthorization.user) {
            std::cerr << "ERROR: WWW authentication password (-W) is given, but username (-U) is missing\n";
            exit(EXIT_FAILURE);
        }

right?