And there's no satisfactory answer.
Seems the recommended solution is the inelegant hack of having WP installed nn times with nn separate wp_config.php files for each turn.
This leads to the following questions:
1. Can I have a unified interface for all the blogs I so install?
2. How about searching: when a user searches my site, how can I make sure all blogs are included and the URLs constructed in search results are correct?
I hope this is a priority in the next release but would appreciate some thoughts about the above.