Feito sozinho, fácil na verdade.
<?xml version="1.0"?>
<root>
<item>
<name>Ctrl + HJKL to Left/Down/Up/Right</name>
<identifier>private.ctrl_hjkl</identifier>
<autogen>__KeyToKey__ KeyCode::H, ModifierFlag::CONTROL_L, KeyCode::CURSOR_LEFT</autogen>
<autogen>__KeyToKey__ KeyCode::J, ModifierFlag::CONTROL_L, KeyCode::CURSOR_DOWN</autogen>
<autogen>__KeyToKey__ KeyCode::K, ModifierFlag::CONTROL_L, KeyCode::CURSOR_UP</autogen>
<autogen>__KeyToKey__ KeyCode::L, ModifierFlag::CONTROL_L, KeyCode::CURSOR_RIGHT</autogen>
</item>
Basta passar esses códigos para private.xml na pasta:
/Library/Application Support/Karabiner
Feito.