Software Deployment

We use Task Sequences to push groups of software packages and scripts a great deal. I have been using Package definition format create definition files to import packages into SCCM 2007 R2 and I can't find any documentation where I can add a specific option to the files without having to Check the box every time I create a package. 

The Selection is under program properties>Advanced>Allow this program to be installed from the Install Software task sequence without being advertised. 

I have looked over all the documentation I can find for Package Definition format and I can't find the option that allows for this.

I have read this document and everything else I can find and I can't find anything that refers to this selection. 

About Package Definition File Format. 

http://technet.microsoft.com/en-us/library/bb632631.aspx

Is there either documentation or an undocumented feature that has the selection for this item without having to add this manually each time?

Thanks for your help.