It would allow selected items(Tags) to be displayed as well as add new ones or select ones from an autocomplete dropdown.
Here is a similar request: http://feedback.kendoui.com/forums/127393-kendo-ui-feedback/suggestions/4219414-tag-template-for-combobox-and-autocomplete
More like combining the combobox and multiselect. I want to be able to type a new string and have it added to the selected list if it does not exist.