Yet Another Blender Egg Exporter (YABEE)

The Blender’s texture settings is quite different from Panda, so I can only “interpret” better or worse some of Blender settings.
I think we can have more or less close result if we attach GLSL shaders generated by BGE to the Panda’s EGG format. Relevant topic: [Blender as a GLSL editor)

As for your problems:

  1. For disable min/mag filter record you can uncheck “MIP map” in Blender’s “Image Sampling”.
    What you mean by “no alpha scalar”?

  2. As I say, I cant fully simulate a Blender’s material behaviour by a Panda’s standart texture modes. For this particular case to see leafs you should set the material alpha to 1.0

  3. It’s not a bug it’s a feature )) Indeed I don’t know why materials shows only when the light enabled. If you really need to see color without lighting, you should remove material and do paint vertex colors.

That would be wonderful