Sorry that PSX Plane is not on my site. I will put it up today.
One of the main enhancements in PSX Plane to the original LR stock plane was the implementation of the lights. My understanding of the approach that LR took to implementing the landing lights is that they superimposed a lighter pre-defined shape on the runway to simulate the effect of the lights. This took no account of which lights were on, or in the case of the taxi light, which way the gear was pointing. This made the imlementation fast, but had some side effects, for example that the landing lights were either all on or all off. In the PSX Plane implementation, the pattern for each light is explicitely calculated. The wing and logo lights show the effect well.
Other modifications include the springing in the landing gear as the plane's attitude changes and animations of the various control surfaces, doors etc.
The creation of PSX Plane was a large part of the development of XView. If people report major problems with it in XP11, I will repeat the development with the newer stock version. If frame rate is a problem, turn the lights animation off in the XView settings or turn off HDR rendering in XP settings and see if this improves matters.
Mike