Custom Closed Tags

[garthenweb]

I like to build a custom tag with an opening and closing tag but can not find a option to set this.
Just got the error: "Tokenization error: test is not a block tag."

kiwi.tools.createSimpleTag('test', function(context, name) {
    return name;
});

{{test "123"}}Content{{/test}}

If there is already an option to do that, please update the readme. Else it would be a great feature!