Hm, I'm not sure, if i got your setup.
I suspect, that -because your MySQL DB count is limited- you want to put all content into on MySQL DB (for different sites) and let all content start "one level below root", so your sites "virtual root folders" are all children of root (node 2). Right?
When: Why do you want to show the "real" Root-Folder (2) anyway? Any click on that will have your visitors go up one level to much and see all websites... Better hide the "root"-Folder from path (see my other posting http://ez.no/developer/ez_publish_3/forum/setup_design/toppath_without_root_folder#msg39292) and start with your "virtual home".
Besides that: I think, no version of ezP supports multiple websites in one MySQL DB. In 3.1, it was possible to install multiple "designs" (now: "Packages") into one DB, while the new ez-3.2-installer does not support this.
Note: IMHO, if you really want distinct sites, you will need multple DB's.... how do you want to restrict the search engine, the admin interface etc, when everything is in one large "content tree"?
