Feature Request: add unsubscribe option to "user profile" page

Great plugin,

I would like to request a feature added.

When the plugin is network activated add an option to individual "user profile" page to allow them to tick a checkbox to unsubscribe.

If the checkbox is ticked the plugin will not sync that user to mailchimp on first import or remove them from mailchimp list.

I know a user is removed when deleted but there are occasion when you don't want to delete ever user.