Interest Groups on user registration page

I am excited to see this plugin! Good work.

I recently installed it with hopes to add a subscribe option to the user registration form (which does display), but it just shows the single top level list name and doesn't display interest groups. I can see the interest groups on the subscribe page (/mailchimp/subscribe) but not on the /user/register page. Is there a way to display the interest group options on the registration page?

If not, I hope you will consider this for a future release. This was one of my main reasons for using the plugin and we have about 5 interest groups (instead of different lists).

Thanks!