Changing satisfaction survey data fields

Does anyone know how to change the data fields the satisfaction survey can read/save?

The current get/save satsifaction survey data components have 5 fields (including an overall score field).

I want to add additional fields to this so I can ask additional questions in the survey, but cannot see how to do this, as the component comes as part of the standard IM/SD library.

Anyone got any suggestions/knowledge?

Thanks

Steve