I'll review your email and think about Mix it Up this afternoon, Kuzco.
Petrucus,
I removed the +/- harm options from Manoeuvre because they duplicated Mix it Up options and seemed a bit dull. There are lots of ways to increase harm with weapons, weapon options, ammo and playbook moves. I want Manoeuvre to be about the clever stuff. +AP is still in there (Aim), which is usually effectively a +harm move, and Take Cover (+armour) is usually a -harm move, so they're both covered to an extent.
Getting the drop on someone gives you fictional positioning, so be more or less powerful than a +1: it could put you in position to make another move ("I'm behind the Merc with a gun to his head; Tell me where the file is [play hardball]"), or to bypass a move entirely ("I'm behind the Merc with a gun to his head; I pull the trigger.")
That's right on for the difference between Hit the Street and Fast Talk. I usually think of Hit the Street working on people you know or are introduced to and Fast Talk working on people you encounter in the course of doing something else.