Hi Chuck
You can use a "People Picker" alike with qSIListForm. However you will need to be able to access and retrieve data from AD. there is currently no out of box support for directly access data from AD but since Quest SI Web Parts support Web services system, you could use Active Direct Web Services (http://technet.microsoft.com/en-us/library/dd391908%28WS.10%29.aspx) to load users from AD.
First you would define Catalog property of the qSIListForm to include an entity that has operations to retreive list of users from AD.
Second, you would define Display Fields property of the qSIListForm to include a field that will serve as the user field you plan to use a picker control. Click Edit button next to the field in the ezEdit Display Fields screen, from the next screen where field details are shown, select "Choice" from the Type dropdown list and click "Edit Options" button. The next screen shows that you could define simple list of options for the choice field, but you want to select radio button "retreive the options for the name of the data table in the data set". This allows you to bring external data into this field to display it either as a dropdown list or people picker. Make sure you have "Use Item Picker" checked and other required fields defined (which is similar to SI Field in qListForm).
I hope this helps.