Customizer for Premium Themes in Pro Sites

Hi!

We're using your Pro Sites plugin to offer Premium Themes to our members. However... since the WP Customizer came out, the Customize or Live Preview link is not available on the Premium Themes, only on the normal, basic level themes. Do you have a fix for this, or a plan for an update? The Customizer is a great feature to take advantage of, especially if we're offering a Premium service.

Thanks!