Limits on how often/how many appointments clients can book
Many services have treatment rules that require the client to wait 4 weeks between appointments, but clients can currently book their appointments whenever. By being able to create rules around how close/far apart specific services can be booked, this will minimize the time needed to review and make sure those rules are being followed, since this impacts the treatment experience.

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Jordan Lumbard commented
Clients should not be able to book no more than three appointments for themselves online.
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Krista Lunt commented
Being able to block or restrict clients from booking appts/services within a certain time frame from another, restricting minors from booking, restricting booking a service that requires an initial appt