Hi Matt,
Looks like this won't work due to a SharePoint limitation. Calling the Web Service to update the list doesn't work. We would have to call the SharePoint object model. Because qRules is meant to be installed in both browser and client forms, we chose the Web service method, which works for standard lists but does not work for BCS enabled lists. We have logged a feature request for the next version of qRules to look at adding OM calls for browser-only forms so that this can be done. Unfortunately, it looks impossible from the rich client. However, Qdabra does provide a Web Service (DBXL) that can update SQL from a rich client form (and no BCS config needed! :))
Let us know if you would like to be a beta tester for this new feature. ETA would be June timeframe.
Thanks!