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.