Add custom shortcuts

<!--element -->
<textarea id="content"></textarea>

<!-- call -->
<script>
$R('#content', {
    imageUpload: '/your-upload-script/',
    shortcutsAdd: {
        'ctrl+., meta+.': { api: 'module.inline.format', args: 'sup' },
        'ctrl+shift+o, meta+shift+o': { api: 'module.image.open' }
    }
});
</script>