Btw only hard mode stops any browser details leaking on the test site: http://webkay.robinlinus.com/ which is awesome, but I wonder how much time you have to spend fixing all the sites that you visit that will be broken in this mode.
Anyone using "hard mode"?
To unblock scripts just turn the 3rd party scripts block to gray which equals a noop for that. Green is explicitly allow which is what we DON'T want since we still want filtering from the filter lists to apply. Basically to unbreak sites you start with setting 3rd party scripts to noop then iframes if that doesn't fully fix a site. This setup is rather course grained but is the easiest way to increase security and privacy with the least amount of user interaction (the most bang for your buck basically).
As you browse with this "medium mode" you'll probably interact less and less as your dynamic filtering list gets built up. I wouldn't recommend using the "hard mode" since there's not a lot to gain from it and it will cause a lot more breakage.
Edit: Also I just noticed this but font blocking is also enabled in the medium mode screenshots. This isn't part of the described medium mode and the author of the screenshots likely forgot to turn it off before taking them. However you're free to try it out if you want but keep in mind it can break the look and feel of sites. Also it may not actually block the downloading of the font if you're using Chrome or a Chromium based browser so there's less of a reason to use it on Chrome.