Add a filterOptions option that will enable users to configure attributes, placeholder, etc for the search box of the DropDownList. 

As my grid edit forms have expanded past the default popup, I have been using editable template. These are bound with MVVM and work well. But not all options work via MVVM like the cascade options below. I would like to use the cascade options in this scenario. It would be great to have all configuration options available via MVVM.

            <select id="ParentID" name="ParentID"
                    style="width: 100%"
                    data-role="dropdownlist"
                    data-text-field="Name"
                    data-value-field="ID"
                    data-cascade-from="ImprovementTargetID"
                    data-cascade-from-field="ImprovementTargetID"
                    data-cascade-from-parent-field="ID"
                    data-source="PEDropDownDataSource"
                    data-option-label="Pick PE..."
                    data-value-primitive="true"
                    data-bind="value:ParentID">
            </select>

Bug report

`DropDownListSelectEvent.dataItem` is undefined when using keyboard to select the optionLabel, but is defined when using the mouse

Reproduction of the problem

Steps

Dojo: https://dojo.telerik.com/IvEXOvUH

Make a selection (e.g. "Apples").
Select the optionLabel item.

Expected

The value of DropDownListSelectEvent.dataItem is the same whether the selection is made via keyboard or mouse (assumedly).
The value of DropDownListSelectEvent.dataItem is clearly specified in the API docs when selecting the optionLabel.

Actual
The value of DropDownListSelectEvent.dataItem is "Select an option…" when selecting with the mouse.
The value of DropDownListSelectEvent.dataItem is undefined when selecting with the keyboard.

Environment
Kendo UI version: 2024.1.130
Browser: [all]