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It seems that valvetronic failure is a very rare event and if BMW wanted to control 'runaway' rpm they could easily cut the fuel or spark instead of blocking off the intake inlet.
Having said that, BMW is very smart and cleaver, and I am sure that the TB has other functions. If it was just for rev limiter, they could have eliminated it all together.
If it 'modulates' and tracks the valvetronic position, it could as it has a stepper motor and position sensor, it could provide just a small vacuum to be present in the intake manifold for the pcv.
So it moves almost in unison with the valvetronic motor?
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