2 questions:Yes, but it only boosts your theoretical streaming speed. You still have to acquire the technique itself which is a big challenge on its own. This still does not mean that you will be able to stream really fast but faster than someone who plays fullalternate and didn't do any further streamtraining.
Does constantly singletapping (and sometimes alternating) by gradually playing higher BPM maps make my hand stream faster within time?(I'm patient for that lol, not saying I want to deathstream with all 300s only after 1 day of training)
Idk about your other question cause hail mouse.-