Yes, you can avoid that step and have the user's account automatically created for them by changing the "User Creation" setting in JFBConnect to "Facebook User Only". This will automatically create the user's account with a username of fb_12345, their email address, but no password. In the future, this user can only login using their Facebook credentials.
There are no other things to configure for the 1-click registration. However, since it's one-click, please note that the username is automatically generated. If you want to come up with a different username scheme than fb_userid, we can help you, but each user's username on your site must be unique, so just using FirstName_LastName does not work.
Hope that helps!