POST via shift+return

private.xml

<?xml version="1.0"?>
<root>
  <appdef>
    <appname>HIPCHAT</appname>
    <equal>com.hipchat.HipChat</equal>
  </appdef>

  <item>
    <name>Swap Enter and Shift+Enter on HipChat.app</name>
    <identifier>private.hipchat_return_to_shift_return</identifier>
    <only>HIPCHAT</only>
    <autogen>__KeyToKey__ KeyCode::RETURN, ModifierFlag::NONE,
      KeyCode::RETURN, ModifierFlag::SHIFT_L
    </autogen>
    <autogen>
      __KeyToKey__
      KeyCode::RETURN, MODIFIERFLAG_EITHER_LEFT_OR_RIGHT_SHIFT | ModifierFlag::NONE,
      KeyCode::RETURN
    </autogen>
  </item>

  <appdef>
    <appname>SKYPE</appname>
    <equal>com.skype.skype</equal>
  </appdef>

  <item>
    <name>Swap Enter and Shift+Enter on Skype.app</name>
    <identifier>private.skype_return_to_shift_return</identifier>
    <only>SKYPE</only>
    <autogen>__KeyToKey__ KeyCode::RETURN, ModifierFlag::NONE,
      KeyCode::RETURN, ModifierFlag::SHIFT_L
    </autogen>
    <autogen>
      __KeyToKey__
      KeyCode::RETURN, MODIFIERFLAG_EITHER_LEFT_OR_RIGHT_SHIFT | ModifierFlag::NONE,
      KeyCode::RETURN
    </autogen>
  </item>
</root>