It appears that currently you can either set a default value of true or false for a subscription. So when a customer clicks to change their subscriptions, the box is either automatically checked, or it is unchecked depending on that default value. It would be nice if instead of a default value, it would allow the option to have the customer's actual current subscription preferences populated when they click to change.
Also, it would be nice to be able to link customers to an embedded subscription management page from the emails we send rather than to a page hosted by ClickDimensions. Right now, the embed code is there, but if you embed the form on your site and link to it in an email the information doesn't transfer properly and it causes an error when a customer tries to submit their changes.