WordPress Directory plugin for a membership site?

Hi! I'm planning a membership/blog aggregator site built on MU and had my plugins all scoped out, including:
Blogs Directory
Members Directory
Autoblog

But then my client says he wants to do the BlogCatalog model and I see your WordPress Directory plugin and I'm thinking it's pretty good for what we want.

My question is simple - if someone creates a listing in WordPress Directory, does that also create a membership that can be included in the blogs and members directory? Does it mean I have one signup form, or is it separate from that?

thanks!

Charlie