Controll support?
There’s no chance that this game is getting official support for controllers anytime soon. The devs have briefly commented that it’s not something that they are considering. I’m not sure how hard it is to get it setup, but it would add to the headache of testing — one more set of things to check, one more set of interactions, especially since the game wasn’t designed from the start with this in mind.
However, there seems to be a lot of unofficial support — there have been various posts on reddit and elsewhere of people outlining how they got their controller to work with the game. The main caveat I’d offer is: be sure to update whatever 3rd party software you use — when gw2 updates, it will sometimes break the ‘hooks’ that people use to make stuff like that work. Sometimes it will mean going a day or two without controller support until whatever gets adjusted.