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LMJD, that's why me and many others go with the manual switch for the lockup, it can literally be a life-saver on long steep downgrades. I do agree with you on the odd TC control logic tho, for comparison most GM trucks will keep the converter locked even in off-throttle conditions and will open it only when you step on the brakes or your vehicle speed drops below certain limit. The E4OD can do that too, but it needs an aftermarket controller for it, from what I've read on the intrawebs the factory PCM cannot be reprogrammed to work in that manner.
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