I really like the plugin and have found it useful! If you don't mind a suggestion for a future version, I'd love to see it open up a little dialog box that allows you to link an email address to custom text.
For example, instead of having:
You could have:
<a href="mailto:firstname.lastname@example.org">Custom Text Here</a>
I realize there is a way around doing it but for non-technical users, it would make things a bit easier.