Howdy folks, I spent all afternoon today bashing my head against the wall, trying to solve the mystery of how to fix the issue where pieces added to a mesh via nifskope show up shiny in game. Thanks to SA, I had previously figured out what the actual issue was: such pieces are missing the entries in Nifskope that connect them to appropriate glow and refl textures. Long story short, I painstakingly figured out how to fix this through trial and error...only to then discover that there is actually already a tutorial on how to do it on my own darn website from when I backed up all the FF tutorials. So, here you go, a tutorial on how to add glow and refl entries to an object in Nifskope:
https://bentongrey.wordpress.com/freedom-force-modding/nifskope/tutorial-4-adding-reflect-and-glow/
"Knowing is half the battle. G I Joe!"
And the other half is colored lasers!