Crankycrank & Delbiker1 your comments are exactly what I was looking for when I authored this thread yesterday. What you indicate as being your practice is what I'll adopt for my own. Being new to threadless, it hadn't dawned on me that there'd be an expansion plug inside the steerer tube, as is commonplace with threaded steerers.

Initially I began searching for the cause of a 'click' I could hear while standing at rest with my front brake applied then pushing hard against the handlebar. I thought perhaps it was from a maladjusted headset, when in fact it turned out to be the front disc brake's pads moving ever so slightly against their retaining pins. Seems inconsequential enough of an annoyance unless and until I learn otherwise.