Page Up and
This package replaces the default keybindings of
pagedown in text editors.
'atom-workspace atom-text-editor': 'pageup': 'animated-page-scroll:page-up' 'pagedown': 'animated-page-scroll:page-down'
You can change the scroll duration and number of rows to scroll in the package settings.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.