I have a logitech mouse that allows you to unclick the scroll wheel so you can scroll at tremendous speed (the scroll wheel has a bearing). I highly recommend this both because it's surprisingly useful and because it's incredibly satisfying.

The one that uses a semi-permanent magnet for that mechanism? It's the only use I'm aware of a switchable permanent magnet (alnico and rare earth half-cylinders wrapped in a coil; pulsing the coil switches the alnico to be either parallel or anti-parallel with the neodymium, turning the whole assembly on or off) in a commercial product; I bought it just for that.

The only problem with this scroll wheel is that the clicked mode does not actually guarantee a scroll event per click. There is a disconnect between the mechanical click and the actual event sensor. This is usually a non issue but if you try to use the scroll up/down as a bind in a game (fps jump for instance) it becomes painfully obvious.

Oh and also scroll click isn’t a thing (but there is the middle button to bind)

For normal work I absolutely love the unlocked flywheel scroll and won’t go back

I’ve used G502 mice for a decade now and the scroll wheel is central to how good they are. The MX Master mouse also has this but instead of a mechanical clickclack it has a button that switches an electropermanent magnet or something to enable/disable the free spin mode. It’s witchcraft.