Incidentally, I've been trying to use the keyboard to scroll webpages recently, and it's a disaster. Nobody does it, apparently. PageUp/PageDown do not work correctly on sites that have a permanent topbar (some of the content is never shown). Cursor up/down often does something unexpected (for example in Mastodon, if you use PageDown several times and then cursor down, you will get yanked back). I think it is a sad r…
The lenovo keyboard with its trackpoint and mouse buttons is a kind of solution to this, but IME scrolling is still a PITA as it needs two inputs (switching to scroll mode while moving the trackpoint)