as far as i can tell mate there isn't...
if you want, i'll post the code to be transported to the testing rooms, where all the weapons(/armor/books/vegitation/items etc) are?
in Morrowind the testing rooms had everything that was in the game, there wasn't anything extra... if it wasn't in one of the testing rooms... it didn't exist.
doubt the case has changed since Morrowind.
only things in the weapons testing rooms better than the glass ones are the Daedric (but much heavier than the glass) and the very "uber" weapons that only have one type... i.e. the Goldbrand (is only a sword, there is no sheild/axe/shortsword/claymore)... and from memory the Goldbrand only has 16 for damage... 2 more than a glass longsword :-/
let me know if you want me to post the code, it'll be put in the regular spoiler colours