I haven't done anything with this because it's not worth my time. I usually only have a couple of accommodations that need given and they are never for extended dates (my assignments are usually open a few days after they are due anyway). I do have some that need extra time on quizzes, but that is a different API call and that only affects a couple of assignments since most are untimed.
Someone has likely automated this, but I don't know who. Maybe they'll chime in?