So, for anyone needing this information in the future – the Qolsys IQ2 defaults work.
dealer code – 2222
installer code – 1111
Thank you for posting! It would make sense the DSC Touch default settings should follow those of the Qolsys IQ panel, as it is a version of the IQ which uses a DSC sensor radio, but the 1.4.3 manual at least does indicate the default installer code should be 5555. Seems strange to change this from one firmware to the next but it is possible.