Allow tiers to be seen or not to other tiers. This will expand exponentially the possibilities of newzenler, as you can create awesome memberships, adding new customers and new content, without them been able to see anything not included in their tiers. It would be very helpful too to change the tier set up from having to select what they can see (making necessary to update every tier every time you add content), to only select what they can not access, that is in my experience less often.