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I know around the area of the year 2000 BMW was experimenting with throttleless gasoline ingines that used EGR to control the amount of O2 for combustion. Not sure if they are in production now or not. I'm sure someone else here knows for sure.
As Fabrio said, when you dont want WOT, it doesnt matter what valve you have in front becuase you want a restriction anyway. With the advent of FI, manufacturers can make bigger throttle bodies so that would reduce the restriction of the valves at WOT, slide valves are best used for carbs I guess.
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