Please can there be an option is dis-enable add-on services from being bookable across different therapists. I know that there is the option to dis-enable multiple treatments booked at once from being able to be booked with different therapists, but there isn't the same option to only apply to add-ons services, and it would be good if we could prevent that from happening and set it so add-ons can only be booked with the same therapist doing the service itself.