I think it would have to be hard coded into Safebit.
I soo want this sort of interface to be in it. I would definitely use it.
Not mentioned here, but this is also a reply to your recommendations/wish list.
Safebit is designed to be extendable, meaning that people will be able to create
add-ons to the application without me (or whoever eventually running Safebit) needing to be involved.
Like TTBit suggested, it will be something like browser addons. And technically it would be done in the same way, using Javascript and HTML5 (the most popular languages used by developers to date).
I'm happy to hear that you guys are waiting for these kind of features, and these features are planned to be implemented inside Safebit when it launches.