In all seriousness though, BOV's or waste gates which don't recycle air [in all applications that i am aware of] are extremely inefficient compared to those that do recycle air. [However they are efficient at adding a noise which usually sounds like this]. Your making boost for a reason and to release that boost rather then recycle it is just going to hinder performance.
You DO [in turbo setups] need a place to release the air. Reason being is that in between shifts the back pressure causes resistance and the turbine to slow down. Then essentially you want the pressure to escape [so the turbine stays spooled up] and then the air be recycled after the vehicle shifts.
The Supercharger does no have this issue as it is belt driven and not driven by exhaust gas. I believe [not positive about this] that when decelerating the s\c can put drag on the engine and the bypass valve opens up equalizing the pressure in the outlet and inlet of the blower.
That being said, from what i understand it can be done, i don't know how and i wouldn't hold my breath on here waiting for anyone to help you with this. [if it cant be done someone plz correct me so i can sleep better tonight]
