I’m only citing the beginning of your post here, but it really applies to your entire experiment: I’m curious what your experience using it is, once you have applied it some. In theory it sounds like a great idea, because of how it isolates changes in the framework from application code. It was something akin to this I was toying with in my head, maybe even taken a step further by using a register-feature function callable by features to register themselves with biff; but thinking about it, that extra register fn might be a bit too much magic, compared to what it accomplishes.
So cool to see you experimenting.