yep, a boost bottle collects fuel vapor that is spit back out of the intake. the vacuum from the intake sucks the vapor back into the engine. If you fully understand how these 2 strokes work with valve ports, some exhaust actually comes out of the carb on the very beginning of the exhaust stroke. this slight exhaust backfeed is what pushes unburned fuel vapor into a boost bottle. on the intake stroke, this fuel vapor is sucked from the boost bottle and back into the engine. It's a very simple but effective way of cramming more fuel vapor into the cylinder. sort of the same effect as supercharging but in a simplistic way. it is not an intake leak because the fitting on the intake and the fitting on the boost bottle are sealed. there is no extra air involved, it's all fuel vapor and whatever tiny amount of air is backfed from the intake manifold into the bottle.
by the way, a hole with a screw in the intake will not work!!!
why do you think intakes are sealed at each end with a gasket? the air/fuel mixture takes place in the carb venturi...not in the intake manifold. my 50 c.c. 2 stroke doesn't even have an intake manifold...the carb is bolted right to the cylinder. if you want to slightly alter the way an engine respnds, long striaght intake runners (or tubes) are better for high rpms, shorter intake runners are good for low end torque. look at a tunnel ram on a drag engine. they have long, striaght intake runners that go straight into the cylinders...better for high rpm power. Look at a stock v-8 carb. intake manifold. the runners are short and curved...better for low-mid range power.
I have built many engines (cars), played with nitrous, intake manifolds, multiple carb set ups, and all that. The intake must be sealed..ANY hole will cause loss a of manifold pressure, (a vacuum leak) and will ALWAYS cause a lean condition and make the motor run terrible.
True, more air and fuel will make more power, but it's all how that air and fuel are able to get into the cylinders. adding more air will make more power, but you will lean the motor out so much, you will lose a piston sooner than you should.