Features
The sensitivity of the TrackPoint is usually adjustable, and can be set to provide an extremely light touch.
Press-to-select is an optional feature, where a sharp tap on the pointing stick is equivalent to a button-click. Any of the three mouse buttons can be configured to be the desired object of this gesture. A problem is that inadvertent clicking of the button may happen when the pointing stick is touched during typing.
Together with software wheel-emulation, the Trackpoint (and 3 buttons) can provide almost the entire behavior of a 3-button, 2-wheel mouse. Tapping button-2 will generate a middle-click; holding button-2 while simultaneously moving the pointer will generate vertical and horizontal scrolling events.
The TrackPoint III and the TrackPoint IV have a feature called Negative Inertia that causes the pointer's velocity to "overreact" when it is accelerated or decelerated. Negative Inertia is intended to avoid feeling of inertia or sluggishness when starting or stopping movement. Usability tests at IBM have shown that it is easier for users to position the pointer with Negative Inertia, and performance is 7.8% better.
Read more about this topic: Pointing Stick
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—Herman Melville (1819–1891)