Greasy Fork is available in English.
Change chapters with a hotkey. For Mangakakalot & Manganelo & ReaperScans
Default hotkeys are:
z previous chapterc next chapter- zooms out= ?or? + zooms in0 resets zoomSmooth Scrolling moved to its own script. It has been updated and is now better than ever. I'm sorry for the inconvenience.
It can now be found at http://greasyfork.icu/en/scripts/423926-smooth-scrolling