Hi MagicMandi,
the position, direction, cone and intensity of the airplane´s exterior lights are controlled in the .acf (aircraft) file - this is correct.
We believe that we have the lights "just right" - based on my 25 years (10 of those in 737´s) experience in flying jet airliners. Most of the default aircraft in X-Plane have lights that are too bright. The taxi-light´s purpose is not "see where you go" - it´s more "be seen when you go". You can also spot obstacles on the taxiway, but not out very far. The light is not intended to illuminate the taxiway.
The reflections are not part of the flight-model, as they do not influence the way the airplane flies.
The cockpit display reflections in XP11 are a new property (as far as I know), so we can not apply them to the XP10 model. We do, however, already have a makeshift reflection in place for the XP10 version.
Cheers, Jan