I played around with the TPS idea a while back, but there was some problem using that. Can't remember if it was the TPS relaying the open signal through the computer or adding a relay or something. Probably solved without alot of difficulty but I didn't want to spend any more time on it at the time.
I do notice how our Buick GN's unlock when the throttle is closed. However, I believe even those are also speed referenced, meaning they don't open once a certain speed is reached causing the TCC to remain locked even when one lifts off the throttle. But not 100% on that. FWIW.
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"Objects in mirror are closer than they appear" 
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