Did you get an answer on this? I am trying to do the same thing. Actually, I want to use WP as CMS on my main site (domain.com), and also on a subdomain (subdomain.domain.com), but I want to use different themes. Do I need to load WP in both places? If yes, then I assume I must use 2 databases. If no, do I still create 2 databases?
Any help will be much appreciated. I’m not very tech-savvy.