Maximum Booking Limits per event type

It would be great if Calendly offered an event-type-specific one booking per client, ever rule. This would be useful for introductory offers and free consultations so that clients could not book these over and over again. It doesn’t happen often, but when it does, it can be really frustrating. Also same with clients that book several time slots only to cancel some of them last minute. 

Anyway, would love to know if this is an easy feature that could be added.

Thanks!