Would it be possible to add a feature to your appointments

Would it be possible to add a feature to your appointments plus plugin. Right now i have clients that use http://www.genbook.com for their appointment system and i am trying to convert them over. the only thing your plugin seems to be missing is a “Customer reviews” option. With genbook, if a client books an appointment after their appointment date they get a reminder email asking them to go to genbook and rate the service(using comment and star system). How can I get this added to your plugin? example. http://www.genbook.com/bookings/slot/reservation/30079258/reviews/?bookingId=826042372&bookingContactId=826042177