I do it with a provisioning script:
<wap-provisioningdoc>
<characteristic type="Registry">
<characteristic type="HKLM\Software\Apps\WESTTEK\JETCET PRINT5\Printers">
<parm name="DefaultPrinter" datatype="string" value="Photosmart D7200" />
</characteristic>
<characteristic type="HKLM\Software\Apps\WESTTEK\JETCET PRINT5\Printers\Photosmart D7200">
<parm name="DefaultModel" datatype="string" value="Photosmart D7100/ D7200/ D7300/ D7400 Series" />
<parm name="Draft Quality" datatype="integer" value="180" />
<parm name="Driver" datatype="string" value="wt5hpapd.dll" />
<parm name="DriverMapping" datatype="string" value="HP DJ GENERICVIP" />
<parm name="High Quality" datatype="integer" value="360" />
<parm name="HoldJobs" datatype="integer" value="0" />
<parm name="IpPort" datatype="integer" value="9100" />
<parm name="Manufacturer" datatype="string" value="Hewlett-Packard" />
<parm name="PrinterPort" datatype="string" value="{IP ADDRESS HERE}" />
<parm name="PrinterType" datatype="integer" value="8" />
</characteristic>
</characteristic>
</wap-provisioningdoc>