The current sheet is really really good. It doesn't 100% accurately handle bonus/penalty dice and my understanding is that can't be done with a script, but IMHO it doesn't make a whole lot of difference either way--we just go with the rolls as it reports them. If you bought the Keeper book would access to the script without pro be enabled? I will admit, I don't actually see any real point to a CoC Keeper book. This isn't a kill the creature sort of game where drag and drop becomes a huge convenience, the way that it very much is in 5E.