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If a gun has a somewhat slow lock time, and short trigger travel, I could imagine a trigger's abrupt stop could disturb the aim just as the gun fires. I've always liked the idea of the trigger remaining in a smooth rearward movement as the gun is firing, for that reason.
I've adjusted both pretravel and overtravel to differing degrees, and find they really only make much difference in dry-fire when I'm concentrating on almost nothing but the feel of the trigger.
The trigger overtravel screw in one of my guns was unscrewing itself as I shot, and until the gun started to malfunction as a result, I didn't notice that it had become un-adjusted from its original setting.
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