2 level registration form

Hello and thank you for the fantastic plugin. We’re planning to use your plugin to build a lawyers database; however my client asked me of the following:

We would like to have a 2 level registration. The user fills in the registration form and once we accept their application, their membership will be approved. However, we’d like to add certain users to a list, you can think of it as a higher level membership, and we’ll need additional information from these users. So my question is, once they’re added to that list, how can we get the additional information from them? This won’t be another form since they’ll be registered users already, but we’d like to have certain fields to show up in their “edit profile” page once they’re in that list. Can this be achieved with your plugin?

Thanks very much in advance.