Restrict list of tags

[gelicia]

An option for restricting tags to the list of suggestions would be nice. I got it working with the following event handler, but something in the options to turn this on would be good.

eventTagTags.on('added', function (e, value) {
    if (tagNamesList.indexOf(value.valueOf()) == -1){
        eventTagTags.data('tag').remove(eventTagTags[0].value.split(",").length - 1);
    }
});