I exclusively use the trackpoint for mouse input and configuring the edge scroll to occupy the entire touchpad meaning that I can use my thumb to scroll without moving my hand away from the trackpoint.
In libinput the edge scrolling is hard coded to 7mm and previous attempts at making it configurable were rejected.
Some HP laptops (EliteBook 8xx) have a track point but only have two physical buttons.
They're also quite large and flimsy, so I expect them to develop enough play that reliably pressing both at the same time becomes frustrating after a while.
In libinput the edge scrolling is hard coded to 7mm and previous attempts at making it configurable were rejected.