Mike,
Not exactly sure what you are looking for, but have you looked at the developer sample that
"This sample shows how to extend the ArcGIS Workflow Manager client application with your own AOI definition tool. In the sample, you will add an address finder tool to the available commands on the job's AOI tool."?
You can find this in the WMX install under Developer Kit\Samples\CustomAOICommand.
Alison