by Luis de Vasconcelos.
I don't think so. The SQLSRV driver is only for MS SQL Server and I've never tried using FreeTDS to connect to MySQL. I don't think MySQL understands the Tabular Data Stream (TDS) protocol.
Life is too short! I think you would be better off spending your time upgrading your MYSQL environment than looking for ways to hack Moodle into using an old version of MySQL that is no longer supported by Moodle.