KeyRemap4Macbook JIS keyboard change YEN key to `

private.xml

<?xml version="1.0"?>
<root>
    <item>
        <name>JIS_YEN to `</name>
        <identifier>private.remap.childa</identifier>
        <autogen>--KeyToKey-- KeyCode::JIS_YEN, KeyCode::BACKQUOTE</autogen>
    </item>
</root>