It works similarly to the steam deck actually. You flick and then tap/hold to stop.

Does this mean the inertia only applies if you remove your finger at the end of the movement, and so non-flicky movements are interpreted normally, with the cursor stopping as soon as your finger stops? That implementation sounds a lot better than how I interpreted the original comment; I thought they meant it would apply to all movements, even when your finger stays down the whole time.