Really don't understand this.
If there's no boost (defined as positive pressure before the intake valve, yes?), it's not boosted.
A non-functioning blower (read above) is not a blower.
End here, unless you're going to re-write the rules.
Advantages:
1. overlap can be anything you want.
2. CFM size for carb no longer limited to 1/2" Hg WOT
3. added vacuum BTDC initiates flow earlier (why wait for the piston?).
4. pumping gain ABDC on exhaust stroke (vacuum assists rising piston).
5. duty cycle = 100%: exhaust opens @ BDC.
6. controls bleed off vacuum from the turbine by solenoid valve when manifold conditions dictate.