I have a hack that I just put together for this. For anyone wanting to have a site where the user is automatically registered and activated, this will do it! It is a very small hack that is simple to install. Get it from the downloads section in Modules.

I have left it up to the admins to modify the _YOUWILLRECEIVE message that is in the language files folder. Or, seacrh for _YOUWILLRECEIVE in Your_Account/index.php and just mask it out.