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					Originally Posted by JayG  Yes, but the resistance of the  potentiometer  will vary depending on how much gas you are giving it at the moment, so the circuit would need to lower the resistance bu a specific amount.  The problem, is that the value you need would vary depending on the potentiometer value
 It could probably be done with an Adruino
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If you are not heal toe-ing -- then you will not be on the gas.
You'll have one foot on clutch and one on brake.
Therefore your TP would be at 0%.
Let's say for argument sake that your 0% is 10K ohms and your 100% is 0 ohms.
Then you could throttle blip to 50% with a parallel 10K ohm resistor.
1/Rto_blip = 1 /R(0%) + 1/R(blip circuit)
like others have said -- some sort of timing circuit would be used to 
enable the duration of the shunting resistor.  An old 555 circuit and a pot 
enabling a relay would do just fine.
Mike