What new aircraft features does FS2004 offer?

I was wondering if here are any new features/effects which have been added to the program to allow more complex aircraft/effects.I don't necesarily mean features that are on the stock aircraft, but ones that could implemented on 3rd party aircraft.For example, after the release of FS2002, people could add dynamic flexing wings planes, which they couldn't do in FS2000. They weren't on stock aircraft, but the program allowed this feature.Does anyone know of anything like this in Fs2004.Thanks.Regards,Bob.