#1 - Oct. 3, 2013, 8:51 a.m.
Whether you use a traditional control-scheme, similar to what you did for the console-versions (none of the other bells and whistles, mind you, JUST movement and combat controls), or even if you're willing to consider support the new, admittedly bizarre Steam Controller, I think it's safe to say that there is really no good reason not to allow it.
Again, it's not as though the entire game needs to function with a controller, merely character-movement and abilities, and a button to pick up nearby items.
Otherwise, everything else about this expansion looks amazing!