ORIGINAL: Guillermo Ibanez
For some jets like the F-16 that has only ailerons, I think that a torque rod can be used. A rod embeded into the aileron with two or three arms inside the aileron and with the conecting arm to the servo, hidden inside the fuse (just like elevators mechanics is designed). I think that for rudder can be done the same. Just my opinion
BRG
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Possibly. You do have to realize though that for elevator surfaces, typically a large diameter troque rod - that is necessary to resist twisting - can be used. For ailerons, which are usually much thinner, the torque rod has to be smaller in diameter, and thus is more succeptable to slop due to the twisting in the torque rod itself.
The main reason, as Oliver reiterated, is that you need the lever arm to handle the torque from the servo to the surface...
Bob