beex,
You can try to add your device to p1db_custom.xml, as the purpose of this file is to be a database of devices, that are not listed in original pepper1 db.
If you are a little bit familiar with XML you should add new <ZWaveDevice> element and fill it's content using other elements as reference. After that use Module Options window in HG's UI and click "Get" button in Node information block.