A question about control system options

[computhief263]

Ok i was jus looking through the control system section of robot rules looking for a answer to this question:

Now i know first gives joysticks ( at least according to my understanding, pg 7 of "kit of parts" red container 3rd item down. correct if im mistaken)
Back to my question, can we choose to use something else as a controller?...other then a basic joystick?

it doesnt say anything in the rules against it (not that ive seen)

any input or direction as to where i can find a answer to my question would be helpful