There are a lot of cool looking unique weapons in the game (my favorite being the Poker), and I find it unfortunate that after some time these weapons just aren't effective enough to be used, especially on higher difficulties. My solution to this would be a transmog system, in which you could for example pay a blacksmith to make your sword look like another one of your weapons. The drawback could be the destruction of the weapon used to transmogrify, for example. Feel free to share your thoughts on this or any ideas addressing this kind of feature. :)