That is actually what happens in a cable throttle system. To put it another way, think of the throttle as controlling airflow (or power), NOT torque. At a constant airflow value, torque drops as engine speed rises, but very roughly, engine power stays close to the same, at least on a naturally aspirated engine. That is sort of a 'rule of thumb'. It is actually quite difficult to get a good pedal feel, in my software we went from a 12x12 pedal map up to a 20x24 pedal map because the chunky feel of a coarser map. A pedal map should actually be implemented using polynomial interpolation and not a linear surface interpolation, or better yet, a formula filled with cosine functions.