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The only problem I see with simply adding a fixed resistance to the throttle pedal is this: at 1500 rpm & 20% throttle position would be lets say 7in/hg manifold pressure. At 2000 rpm 20% throttle position may be 12in/hg man pressure. So you see the trend anyway. I question whether any fixed force is gonna cut it. In the picture I drew out, you'll have the same amount of force pushing back on the gas pedal at all rpm for a given load. Turn on the headlights and AC and it will push back that much more.
I like the feedback a little caster gives the steering and the feedback I get from pushing the brakes harder. Why not feedback from the throttle? In fact, I would be surprised if someone somewhere in racing isn't using something similar so the driver has an idea how much torque he's putting on the ground.
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