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Ok. I just had a good hard look at the Toyota shop manual, namely, the electronic transmission controls. It is controlled by the engine ECU, and there are 4 outputs: three shift solenoids and a TC lockup.
It would be nice to come up with an electronic gizmo that overrides the TC lockup output from the ECU. Here's what I'm thinking, using signals from the TPS and VSS:
If vehicle speed is above ~25 km/h and throttle position is below ~25%, my "device" triggers a relay that sends power to the TC lockup. If neither condition is met, the transmission acts normally.
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