First of all, playing a first person shooter with a game pad is nearly impossible.
If you insist on leaving the unparalleled accuracy of the old mouse + keyboard combo, then there is probably setting in wolfenstien to accept game pads.
Also keep in mind that computers handle digital and analog signals differently. So if you have a gamepad with a joystick and a directional pad, then maybe one or the other works. You'll have to figure out which one wolfenstein recognizes and then switch what you'd like to use to either digital or analog (usually).