1) Engine, Instrument Cluster, Steering wheel, update function and programming (Special in 1.4 and 1.6 diesel engines)
2 ) Immo Key reading
3) It should not be need the Security Code to do some Basic settings and Adaptations. Either channels. It should have two options: channel and adaptation documented, as we have already in some cars.
4) VIN number, should be possible to change it, even if it is already one recorded.