How To Only Allow for MailChimp Registration?

Team WPMU,

Is it possible to not have any of the social registration options but maintain the MailChimp registration?

My clients aren’t that interested in going through the many steps to integrate the social features — and it’s a lot of steps, with setting up separate apps for all of those services for not much payoff — but they are EXTREMELY interested in growing their newsletter list. Plus, integrating MailChimp is simple in comparison to FB, twitter, etc.

If I try to hide the social services, it simply eliminates all commenting, which isn’t what I want.

How can I enable ONLY the MailChimp opt in? And, if that can’t be done with this plugin, can it be done with your MailChimp specific one?