That’s the opposite of poor trigger control.
The rule is: Keep your finger off the trigger until you are ready to shoot. In the game, you are always shooting or ready to shoot – therefore, keep the finger on the trigger.
I’d actually say that setting wise, it’d be more uncharacteristic to have the character exhibit proper trigger discipline. The game is set in 1912, while strong enforcement of trigger discipline is a much more modern thing. As such, poor trigger discipline isn’t entirely unwarranted.
When I was doing animation and demos I knew a couple artists for Electronic Arts, and none of them knew actual jack-all about guns or had any experience with shooting anything but a plastic toy – except that to them it (the gun) really was 1.) an artistic tool that, 2.) represented a lot of psycho-sexual desires and POWER. As artists they were really sunk into the Freudian aspects.