In the movie X-Men : Days of Future Past, Magneto is shown not only controlling metal but breaking it down to microscopic level, inserting it into 8 different robots at the same time, controlling and operating these robots and their internal parts and system that he hasn't seen. Doesn't that give him the power of omniscience or at least more than his original powers? I don't think he ever has these powers in the comic books or in any of his appearance in movies or book.
EDIT
The movie shows him having an extra power than his real and original powers. He can only control the metal, not control the operating system of other robots with the help of metal he just broke down. Apart from that, who's to say that the main functioning core and system of those robots was made up of pure metal? It could have been anything. But he altered their programming and turned them against the good guys without having any knowledge of science or programming.