We will never add items like this to the gameshop its to game breaking, we already made the mistake with the mounts, which before we went live were never supposed to add to characters, but had very little choice once the game was up.
We may add some different types of medals/shoulders, but cosmetic wise or like we have with the skill medal, that offer non game stat changing rewards for people to cut corners for the boring stuff if they choose to.
Like what has been said here, the only way we would ever consider shoulders/medals with stats is if we ever added or implemented a system where you can gain a good amount of GameGold through another means, meaning everyone has the fair equal opportunity to benefit.
-Apocalypse Team