ok, in my testing here, the UserInfo token is only replaced in a custom template if the user is logged in and includes the username and ip address. I suppose we could include the ipaddress if the user is not logged in, but currently it is only doing that with logged in users, which is as you say different behavior than the autogenerated notification.
I will log this in our project tracker and fix it for the next update of Form Wizard Pro. I'll include a link to this thread in the project tracker so I will remember to come back and post on this thread when the next update of Form Wizard is ready.
Hope that helps,