Overconfidence is a great trait for allied NPCs to have. Some captured orcs need tying up? Sure, Jimmy the Ranger can take care of it! Even if his Dexterity is 5 and he doesn't know the difference between a granny knot and a reef knot!And we can't think of any more intutive way of controlling the legs of a walking vehicle.
GM: The crew spot you on the roof of their walker.
Chewbacca: Out of there, you scoundrel! I toss him off the roof.
Widdle: Here, driver driver driver.
Major Marquand: That's not very convincing. Put some more emotion into it!
Major Marquand: Much bett—
Wunka: We have control. We'll get this thing moving!
Chewbacca: Do you buffoons even know how to drive a walker?
Wunka: How hard can it be?
GM: It rocks unsteadily beneath you.
Chewbacca: I climb inside and take over.
GM: The walker controls are four buttons, labelled Q, W, O, and P.
R2-D2: Oh no...
Chewbacca: Hmmm. I press the O.
Chewbacca: Hmm. If only they were labelled W, A, S, and D.