By only briefly pressing the stalk, up or down will set the indicators to operate just 3,5,7 times depending on the customisation one sets.
If one presses and holds the stalk up or down for a couple of seconds it will set the indicators on until the steering is turned in the direction opposite to that indicated.
If required to maintain the indication during direction changes, perhaps negotiating roundabouts, simply hold the stalk up or down as required.
Personally I find it all very intuitive and works really well.
I also find the audible notification rather refined and pleasing, so much better than the rather jarring tones used by some manufacturers