Tickets - the Festiniog Round Robin and North Wales Rover for a start, but there's nothing more local.
Timetable - agreed, though the FR has for years aimed to provide connections and their timetable is rather complex these days, I think because of fitting in with the WHR.
Agreed - a little detail, though, the Sherpa has a 30-minute pause in the middle of the day, either for meal breaks or to fit with school times.
I don't think the line has potential for school traffic, unfortunately, but you would probably still need the half-hour "hiccup"