I wonder if everyone is overlooking the fact that modern accelerator pedals are only one of several forces involved in controlling the fuel flow into the intake manifolds. One that I can think of is the Cruise Control operation which is supposed to move up or down in order to maintain a steady speed. The other is the transmission linkage that is used to effect the downshift when the acceletor is depressed abruptly as when passing.  Of course it is much simpler to blame the floor mats to pacify the populace.

I once had a 85 Dodge Lancer that accelerated while entering a parking garage and scared the bejeebers out of me. When I took it to the Chrysler shop they discovered a faulty solenoid and spring device.