Yeah, The Dustmen and their leader actually have Telekinesis as their power, that is why their constructs and powers always have that orange glow around and inside them. That is the binding TK energy. 

You see, in the Infamous universe, when you solely have Tk powers you don't have any "offensive" or "defensive" powers. The way TK works in the InFamous Universe is that someone with TK spends years training their powers to move objects, as most TK powers in most universes work that way, but rather then just picking up any old object or material the TK power in InFamous essentially "link" with a material and you have to train that "link" like a muscle. The Dustmen and their leader use scrap metal and junk metal because it is abundant, and supposedly easy to link with and use as a weapon.