I appreciate your frustration but I also think I see the source. To generate a list of everything that is NOT in the simulation is, I'm sure, quite a task. My thought is that PMDG has described everything that is in the simulation and that, if they haven't described a function, then it's probably not there. Asking about a specific issue, such as engine out VNAV, seems a good topic starter. Believe me I am not trying to be condescending here, just sharing my perspective.