Allow custom availabiity status during booking
Please allow to customize status for booking, e.g. to allow to set status to "free" by default when booked. In some cases, this is preferable if bookings app is used for long-term bookings (e.g. several days in hot desks system) where setting "busy" status for the person (not service) interferes with calendar by showing person as busy for the whole day, where in reality that booking would not interfere with other, regular calendar bookings.