In Excel/Access you can start typing in a combobox and then the curser will automatically jump to the first matching record (and selects this record on tab). Please add this functionality to the Dropdown.
Options to add should be:
Autocomplete - true or false
AutocompleteType - first letter or Full string (displayValue)
Change selected record with arrow keys
Probably this should not Filter the items but just jump to the appropiate record.
The option should also work if isSearchable is set to false