I've looked through the code and can't really identify the submit button event for normal submits. Where could I find the line of code for the submit function so I can add my onclick tag?
the easiest way to include jQuery (if you don't have it already included in your site's header) is to enable the Date Picker option in cforms, see Global Settings.
"all" you have to do then is to create a jQuery script that gets executed after the page has been loaded (see docs.jquery.com / google for examples) that attaches your own function (which in turn calls the clicky.log function) to the "onclick" event of the send button.