Adjust "Status of Services" monitoring config

I disabled pop3 in dovecot as we only provide imap access. POP3-Server is now shown offline in monitoring as expected. Where can I adjust monitoring to not check pop3 service?
Having a look at the code, there seems to be no other solution than changing the code below, right?
server/lib/classes/monitor_tools.inc.php

PHP:

                /* Monitor POP3-Server */
                $data['pop3server'] = -1; // unknown - not needed
                if ($services['mail_server'] == 1) {
                        if ($this->_checkTcp('localhost', 110)) {
                                $data['pop3server'] = 1;
                        } else {
                                $data['pop3server'] = 0;
                                $state = 'error'; // because service is down
                        }
                }


Thanks!