Joe, There aren't any config/program files you need to change. The EAR is exactly the same. The HTTPS setting is set in the admin console. Search for HTTPS in the WAS infocenter for the specifics. Also, note that you need to enable your web server for SSL too if you are using one.
I'm not sure if it is possible to enable HTTPS in WSAD.
I'm moving this to our IBM forum as it discusses WAS as well. Someone there might know more about HTTPS in WSAD as well.