I've read through almost the entire forum - lots of good threads.
One thing that occurred to me is this. When you are confronted by a perp, why not do what a LEO would do in that situation? After all, they are trained in 'preemption' drawing down on you if there's a hint of a problem.
Now, arguably, they come up on a traffic stop and they are not subject to brandishing, and are performing a legal detention, but we should try to learn by their example since their actions are often well thought-out and planned in advance through countless examples. They know when to put their hand on the gun, when to draw at low ready, how to give voice commands, how to best prone out the perp.
So, while I'm not saying 'act like a cop', you can keep that picture in your mind.
For example, a street person approaches you, and after being turned down puts his hands in his pockets. Why not have already said - "I don't have any cash, back off and do NOT put your hands in your pockets or make any hasty movements".
If he does put hands in pockets, having ordered him not to, it's then OK to draw your HG into low ready. After all, he could almost have the drop on you, willing to shoot through his pocket.
At the same time you should not be standing still but seeking cover. Let's be honest, often we don't go into defensive mode because we don't want to be embarrassed by over reacting. If you are having a confrontation do not underestimate it. This is what I mean by acting like a LEO would act (within reason). Be rude - be forceful, seek cover and prepare to act. If it turns out to be a girl scout selling cookies you can always apologize.
One thing to be aware of, and that's 'saying too much'. If you start talking to the bad guy (BG), it gives him a handle to start something. Just keep walking but keep your eyes on him and don't get into a conversation if the person looks like a panhandler or derelict. You're creating distance and you're gaining time.
That's a key - gain space - time and distance. It gives you more time to react. If you can palm your HG in your pocket you are already drawn down on the BG without giving anything away. It gives you a LOT more options and time to decide to pull the trigger if you already have a HG in your sweater pocket and the BG can't see it, see the type or assess the threat. If you create confusion in the BG ("is this guy armed, maybe I should leave and find an easier target?")
We know they fear us more than the cops (we're a tad unpredictable).
While you are creating space it's also a good idea to be accessing your weak side non-lethal options. Combat flashlight, OC spray. (test these in action, btw).
It takes time to deploy and we should be getting ready during every second we can afford. Cell phone out, or non-lethal, giving directions to your partner if you're with them, getting behind a barrier or car and generally improving your tactical position (get the Sun in their eyes, for example).
Hope this is of interest.