Hi ddbradshaw
I'm going through old posts and addressing issues, where possible. Your request is one that the Developers would like to submit as an enhancement: That is, there is currently no existing service or code example within the APIs to take a thematic map and print it to PDF. They agree that it would be convenient for users to be able to simply select a map extent, along with a variable and generate a PDF thematic map by clicking on a button. They've asked me to get your name if possible to add to the enhancement request.
Thank you for the suggestion!
Kristen C.
Esri Support Services
888-377-4575 X2