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I've adjusted mine, I do not see TCU compensating (but I've got one of the very earliest 92 cars), ECU does compensate and idle revs eventually become normal.
If I rotate it counter-clock wise (lesser voltage), 1-2 shift becomes smoother, but 2-3 shift with little throttle produces rev surge.
If I rotate it clock wise, 1-2 shift becomes very quick and jerky,
2-3 shift surge disappears. Downshifts become noticeable when gradually braking coming to a stop. The same effects happen if I do not rotate TPS, but simply drive at altitudes ~ 6000 feet. (Less oxygen in the air, more throttle required, ECU compensates because it has atmospheric pressure sensor, TCU does not - no pressure sensor and no information link from ECU).
Before you asked - mine is still a car, not an airplane :-)
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