I just don't like manipulating the Safety with the DST set.
It's just easy to grab ahold of the rear/set trigger and hold it there. It's secure and the rifle cannot fire at that point.
Then release it by touching the front trigger.
With a DST,,The kicker sear and the bolt sear are engaged with release still measured in lbs.
It's the DST mechanism itself that has the let-off measured in oz. or part of. The engagement of the DST trigger sears is still (or should be) positive.
It's simple leverage within the DST mechanism that allow the extremely light let-off.