Spreadsheet editor type "select"

Is it possible to define a list of values in a spreadsheet cell, like in this example DHTMLX - Spreadsheet. Types of editors (datepicker, timepicker, select) , but allow the user to enter additional values?
In the example, if you enter a value which is not in the list, a validation error occurs.

Select editor does not suppose to use the values out of the available options list.
The only solution is to change the list of the available options from the “Data->Data Validation” menu.