These have been made on and off since 1995 at the latest. They never work out even though you'd think they'd be super popular for 3d modelers at least. I first encountered one for SGI workstations.
replyhttps://en.wikipedia.org/wiki/SpaceOrb_360 as one example.
This guy made exactly what you describe
replyTwist scroll requires two sensors and is patented by Kensington.
replyWhy does it require two sensors?
replyDo you know until when?
replyThe Kensington SlimBlade scrolls when you rotate the trackball.
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