I can't find any contact information for Thomas Larsson so I will post this here in hopes it helps someone.
The mhx2 import code assigns all materials a roughness of 0.2, this is too high for glossy things like eyes, and too low for things like skin. There is a quick and easy fix for this, if you have mhx2 installed in blender, in your blender installation, (e.g. C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\import_runtime_mhx2, you will have a materials.py file with this line:
glossy.inputs["Roughness"].default_value = 0.2
You can change it to this:
glossy.inputs["Roughness"].default_value = 1.0 - mhMat["shininess"]
and from then on models you import will have glossy eyes and not have glossy skin, etc.