Members Directory for WP single install instead of MU?

Hey guys and gals.

I'm new here on WPMUDEV, but have already implemented quite a few of the smaller plugins on a site I'm in development on. The Members Directory plugin is exactly what I need, except, I'm using a single WordPress install and not a MU site.

So my question is if anyone has successfully integrated this plugin, or one similar to it, on a single WP install? It doesn't work, and I have yet to dive into the php of the plugin, but I was hoping there was a simple work around.

I need the search feature for users, as well as the ability to add custom fields to the user's profile page on set up.

Thanks for any help in advance.

Cheers,
Burleson