Model color editing and output

Greetings and thanks much for this awesome plugin!
I love how great it works and performs but i have a
big question regarding on how to export material colors
for this viewer properly and on how to edit
the detault values. (amd remore the specular)

On every Software or viewer is use, my .stl files
are usually grey with no specular. I’d like to imitate
this here aswell.

Thanks in advance!
Chris