Message Moderation.
I already have a directory site (I took it on from another company for the client) which has a very Neanderthal CMS. Although it does a couple of plus points.
When a site visitor contacts a 'paid' business listing the message goes into a holding stage to be moderated (for spam reasons only) . Then this message can be approved or deleted. Also if a paid business listing has expired, and a message has been sent, then the business owner will be sent an email to advise him that he needs to renew his listing to view the message.
Does your system have any similar features? Not a deal breaker, your theme looks like amazing as it is, it's just that i would hate to code a plugin only to find out that the option was already there.
Congrats on an amazing theme/component (thats the Joomla man in me :) ).
Thanks in advance. Wayne.