Is there any progress on this? I know savvycal has something like this but it’s only a “suggestion” for the time, which is still better than clients being able to checkerboard my schedule. Can there be an algorithm that the whole day is available, but if a client schedules an 11am then the only two appointments that are now open are a 10am and 12pm? And then if the 10am also gets booked it opens the 9am? 

It makes sure I don’t have two bookings at opposite ends of my day.