Jason -- I'm not ready to do this on a live site.
The Continue Button calls the clearAllServerErrors() function in wa_servervalidation.js with the onClick call. If I remove the Shipping fields there seems to be nothing else for the form to do. I can't see where the call to go to Paypal occurs -- I suspect that's what I want to happen instead of the clearAllServerErrors() function.
trainingcheckout.zip attached