Right now, if I set my availability to e.g. 8:00-14:00 and the appointment length to 60 min, the booking page only shows bookable times every 60 mins (8:00, 9:00, 10:00, etc.). This greatly limits the times customers can book an appointment for.

When setting up the booking page, there should be a setting for the start interval between appointments. So, for example, if I set the interval to 30 min (most booking softwares offer 15, 30 and 60 min as options), customers will be able to book a time for a 60 min appointment every 30 min.

In my example above, this would change the available bookable times to 8:00, 8:30, 9:00, 9:30, etc., effectively doubling the number of available times.

I think this is an essential feature for people who want to use this with their customers, because if a client is only available at e.g. 11:30, the fact that they cannot book that time (even if I'd be free, it's just that that time is not showing as an option in my booking page), means a lost customer.