Enable instant page scrolling buttons

[rowebot78]

200ms page scrolls can be setup with KeyMapper:
https://www.reddit.com/r/hisenseA9/comments/1diyhwj/page_scrolling_with_buttons_in_android_apps/

Would be a minor benefit to be able to replicate this. But a much bigger benefit if 0ms scrolls are possible (so no scrolling animation and it looks more like a standard page turn). This can be setup in keymapper but some apps don't accept really fast scrolls e.g. PressReader.