Okay, so I took my airsoft 1911 that I use for manipulation practice and used a red paint pen and applied a layer of fresh paint on the side and top of the thumb safety (not the underside). After a minute or too where it was tacky dry, I took these pics.
First just the Gun
Next the standard way most people ride the thumb safety regardless of where the gun is pointed.
Now what I do - when the gun is not on target
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When I rotate the muzzle onto the target whether coming up from ready going to the two, whatever, then I roll my thumb over the top of the thumb safety and snap it down.
The end result you can see how much pressure I apply underneath the safety (enough that paint from the side of the safety ends up on my thumb)- here I've relaxed my grip to show you:
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This is something I've thought a lot about. The thumb safety on a 1911 is ergonomically placed that no detectable speed difference is found from using a hard index safety on and rolling on top of the safety to go off. If I've made the decision to draw and fire, I get on the safety early, but don't disengage until the muzzle comes up and get to work.
The hard index for safety ON comes into place when the gun is drawn but muzzle isn't on target or the decision to fire hasn't been made.
The reason I bring this up, is the hard index safety on has your brain registering that the safety is on: to shoot I need to go safety off. Regardless of which position you're shooting from a hard index on the safety adds an additional brain layer to safety on/safety off.
I also holster like this break the muzzle from the target, safety on, hard index against thumb safety back to the holster. Once the gun is in far enough that I have to break the index, I roll the thumb up between hammer and back of slide and finish inserting the gun.