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I've been thinking about this a bit more and since no-one has reponded yet I think I have the answer to my own question.
1. some people here have already blocked off their PCV valve from the intake mani and have found no ill effects. This means that the vacuum from the intake pipe feeding the turbo alone when off boost is probably adequate
2. off boost, the PCV valve exit position already provides adequate scavenging of the crankcase in the factory system
3. off boost, the vacuum from the intake pipe has the exact same vacuum as the intake manifold as its generated by the same source ie the pistons. It will be only a little less due to the fact that the turbo and IC pipes and intercooler will present some restriction. A boost/vacuum guage could be connected to one of the vacuum hose fittings going into the intake pipe to compare its vacuum to the IM vacuum
4. on boost, will the PCV valve exit postion provide adequate scavenging of the crankcase? Still not sure about this one. Its in a simllar position to the slider2828 mod only on the other side of the cover and on the side not on top
5. as a further way of using the existing factory gear, for those wanting to keep it stock looking, the hose from the crankcase could be routed straight to the T in the cover, bypassing the factory oil seperator, and the seperator could be used as a catch can between the PCV valve and the intake pipe
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