1 Domain, Multiple Subdomains -> Multiple Topics

I was wondering how vBSEO would help me if I have 1 domain (let's call it www.fruits.com), but I have active forums for various subdomains already in place (apples.fruits.com, bananas.fruits.com, etc).

All sites share the same user table, but I use .htaccess to rewrite the homepage and show them a custom vBAdvanced index (apples.fruits.com -> www.fruits.com/index.php?page=apples). Each vBAdvanced index is linked to a child template that is created specifically for that subdomain. the fact that all sites it part of www.fruits.com. is almost completely hidden (unless they roll back through the navbar).

It's my understanding the vBSEO only rewrites 1 domain, so how would I go about raising my rank for each of my subdomains, as well as having my main domain inrease for the "master topic (ie, "fruits")?

I'm very excited about vBSEO, and hope that I will be able to use it for my communities.

For SEO purposes, using a single domain is actually best. You can set up search-engine-safe 301 redirects from all your current subdomains, pointing them to you primary domain.

vBSEO uses the domain/forums URL supplied in the AdminCP, so it only supports one.