I would rate it Excellent if it had an option to define the B site configuration.php file settings on the fly. ie.
Temp and log file paths.
And ofcourse the most important one, Database name and user credentials.
to define the configuration of site "B", simply replicate the file configuration.php Site "A" and connect to admin the site "B".
but beware, do not forget to return the file configuration.php in exclusion before the next replication site "A"