The only way to build boost is to turn the blades and that takes exhaust gasses. What some have done is to put a little nitrous boost until it reaches around 6 psi or so.
On an automatic it is easy, put your foot on the brake and gas at the same time till the boost builds then keep it floored. Manual is tougher as you probably already know, there is really no way to get a positive pressure in the manifold without a load. If you rev the engine high enough, when you drop the clutch the impeller will be spinning fast and even though there will still be a lag it might not be as bad.
That is why super chargers work better.
Russ
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