With the DA Pre travel set screw installed and the pistol Decocked (Hammer at the half cock notch), the at rest Trigger position will be shorter than without it. The decocked DA Trigger pull will start later but the Trigger will still be eraser to reach.
To be clear, the at rest DA trigger position is the same with the Hammer at half cock and the fully down position.
From my perspective, whether or not there is something to gain is dependent on the shooters ability to comfortably reach the Trigger in DA or the other potential benefits of a reduced DA pull length.