I was wondering if you had thought of making the plugin available from shortcodes?
It would be very practical for me to add it to a front page that only my Editor could access. Thus I do not have to let my Editor poke aroundd in the back end with the dashboard and so on. I also think this would enhance the usability and increase the use of your plugin.
Is it much work to expose it through a shortcode, just the Email users part?