adding adwords tracking to a Click instead of a page load using goog_report_conversion
General advice: don't use "simple" modules for non-simple tasks.

No easy way here, you need to inject your JavaScript code, and attach additional behavior to that button. Worse, you would need to make sure there is enough time for function to process. My colleagues use thank you page if feasible for that very reason - browser will do it's best to minimize time between button click and page load. On thank you page that is not an issue.