Request for Team Member Specific Project Sharing Feature in Relume Team Plan

Me again! We're really really enjoying Relume at our agency and have just upgraded to a team plan. Another thing id love to see is team member specific project sharing. ie we have a situation where we have an external partner in to edit and add content to the wireframes. At the moment I've had to hack this by moving all our other projects into my personal space (i set up the main account) and then put that one project in our new Team area. It would be brilliant to allow only him in ONE of our projects within our team plan.