Disabling Typeahead auto-selection

Created by: sheeley

I'm working on a project where we're using Typeahead as auto-suggest, not the only options. The default behavior of selecting the first option can lead to undesirable behavior. Same thing for clearing the text box on enter if nothing is selected.

I'd be happy to submit changes in a pull request, is this something people would use/are interested in? Or have I missed something completely obvious that already exists?