Excuse the double-post, but I should add that even if that guy doesn't make something with Square's API you can bet someone else will. (Blue Gartr for example.) I don't recall an exact date ever being given, but the API is supposed to be released within the months following release. SE shouldn't have any qualms with add-ons made with that, so I believe you'll be able to get what you seek to improve your play coupled with peace of mind with some patience.