My Atom keymap for focusing and splitting panes, and moving pane items. Based on the shortcuts from the Origami (https://packagecontrol.io/packages/Origami) package for Sublime Text.

keymap.cson

'.platform-darwin':
  # focus pane
  'cmd-k left':        'window:focus-pane-on-left'
  'cmd-k right':       'window:focus-pane-on-right'
  'cmd-k up':          'window:focus-pane-above'
  'cmd-k down':        'window:focus-pane-below'
  # split pane
  'cmd-k cmd-left':    'pane:split-left'
  'cmd-k cmd-right':   'pane:split-right'
  'cmd-k cmd-up':      'pane:split-up'
  'cmd-k cmd-down':    'pane:split-down'
  # move pane item
  'cmd-k shift-left':  'indow:move-active-item-to-pane-on-left'
  'cmd-k shift-right': 'window:move-active-item-to-pane-on-right'
  'cmd-k shift-up':    'window:move-active-item-to-pane-above'
  'cmd-k shift-down':  'window:move-active-item-to-pane-below'

'.platform-win32, .platform-linux':
  # focus pane
  'ctrl-k left':        'window:focus-pane-on-left'
  'ctrl-k right':       'window:focus-pane-on-right'
  'ctrl-k up':          'window:focus-pane-above'
  'ctrl-k down':        'window:focus-pane-below'
  # split pane
  'ctrl-k ctrl-left':   'pane:split-left'
  'ctrl-k ctrl-right':  'pane:split-right'
  'ctrl-k ctrl-up':     'pane:split-up'
  'ctrl-k ctrl-down':   'pane:split-down'
  # move pane item
  'ctrl-k shift-left':  'indow:move-active-item-to-pane-on-left'
  'ctrl-k shift-right': 'window:move-active-item-to-pane-on-right'
  'ctrl-k shift-up':    'window:move-active-item-to-pane-above'
  'ctrl-k shift-down':  'window:move-active-item-to-pane-below'