Customization of Affiliate Script

Hello ;-) We are looking for a simple customization (hopefully simple) on the affiliate script located at [login to view URL] This is a great affiliate script, but I need to configure for my needs. I will provide all files if this can be done to my specifications. Our website is www.Free-Turnkey-Websites.com. Under normal conditions, I understand that a cookie is passed through the shopping cart and that is how affiliates are paid correctly. Our website is different as some of our products are actually free. None, I repeat NONE, of our products pass through an actual shopping cart. So, we need a software/script that can track the usual referral stuff, but instead of applying a tracking cookie via shopping cart, we need to be able to put the tracking info and apply to the SUBMIT botton on Step 2 (example at [login to view URL]). Can this be done? Not all customers will be paying (depending on product), but all customers will be sending their info through the simple email form that is shown on the above example. Thanks, Rob