private.xml

<?xml version="1.0"?>
<root>
  <item>
    <name>Remap ShiftL + F19 to Caps Lock</name>

    <appendix>(ShiftL + F19 to Caps Lock)</appendix>

    <identifier>usercustom.f19_shift_l_to_caps</identifier>

    <autogen>
      __KeyToKey__
      KeyCode::F19, ModifierFlag::SHIFT_L,
      KeyCode::CAPSLOCK
    </autogen>
</item>
</root>