Is it possible to create a select view with an editable input, e.g. the user can either choose from the available options or enter a new value at the top.
That’s typically called a combo-box. You could check out a couple of the ember addons: http://www.emberaddons.com/?query=combo Haven’t used either myself though.
###disclamer: Shameless self promotion I made a completable-input that can be used for that: http://emberobserver.com/addons/ember-cli-completable-input you can just set the threshold to show completion to 0 and it will show the select list as soon as the input is in focus.
After making it I saw that there were a couple of other solution you could use, check for typeahead you might be more lucky