A modular solution to 
A modular solution to Atom keymaps.
Any valid keymap (.cson) file inside ATOM_HOME/keymaps/ will be loaded automatically, or reloaded if modified.
This package does not interfere with the existing keymap.cson, so you can slowly transition to this more modular approach.
The Atom Keymap… menu item will be overridden to open your keymaps folder in a new window, along with the default keymap.cson if it still exists.
Your keymaps will be automatically added to the list of extra backup files if the sync-settings package is installed.
apm install modular-keymaps or search “keymaps” under packages within Atom.