Is this not what you mean: https://www.youtube.com/watch?v=7H8o_-7bKIU? I really doubt it's as fast/accurate as a trackpad even if you master it. This tool looks to be as fast as a mouse if you master it in many situations. But you would need a direct comparison by skilled users for each to be sure. I just don't see how a mini stick will ever beat pressing two buttons.
It's definitely not as accurate as a trackpad or a mouse, but it's not to hard to get very close. The benefit of it is that it's right on home row. You don't need to move your hands to use the mouse.
On my thinkpad, I use the trackpoint and trackpad equally.
My experience is that a mouse is most accurate, followed by a trackpoint, followed by a trackpad, but then again I rarely use trackpads. I inevitably move the mouse when I take my finger off or try to press buttons. Also if I leave it enabled, I inevitably teleport the mouse around the screen with my palms, "palm detection" or no.
Sadly every non-IBM/Lenovo trackpoint I've ever used is awful (although significantly improved by putting a Thinkpad cover bit on the joystick, if you're stuck with one).
That said, having played through the SC1 campaign with a trackpoint... even the best ones are not as good as a real mouse.
Itβs faster, but less accurate than a trackpad, and certainly faster than keynav (and probably the thing in the post, which is a re-implementation of keynav).