That's right. I just thought about it as an feature to ispc because I saw the email import feature in the tools section.
So all the things like email addresses, databases, webs and so on (without the data) could be done inside of ispc.
Copying over the database contents could be done inside ispc, too.
If you make it mandatory to use a locally stored tar.gz with all the web data to restore you could do this via the ispc server scripts.
That's the reason why I asked myself if it would be an "upgrade" to ispc having such a feature.