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the engine torque control wire is what cuts power when the transmission wants to shift. I don't think you want that wire.
The place to look (I think) would be to put some kind of circuit to the TPS sensor wire. This as you know varies from 0.5 to 5 volts and is used by the TCU to figure out how agressive you want to drive.
I have no idea how to design it, but you might want something that with a flip of a switch changed the signal from 0.5-5.0 V to 2.5-5.0V. Keep in mind the TCU (to my knowledge) does not learn like the ECU does, so all it would think is you're always in somewhat of a hurry and sometimes still go to WOT.
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