Hi guys,
Thanks so much for your patience on this. As you know we send millions of emails that have multiple links in them. As such, building a scalable solution for this took time. I am happy to let you guys know that we will be making this feature available this week. This will be available for global stats, categories, and newsletters. You will also be able to retrieve this over our REST API. Please don't hesitate to let us know if you have any questions.

Thanks for the awesome feedback! That is a great question. Currently we count/log every time you open an email. The reason being is that some users forward the email to others and we want to be able to track those opens. It looks like we've found a solution to detect unique opens (even on forwards) based on a few parameters and we will be working on a solution to detect that. Thanks for bringing it to our attention.