Selectize.js is great even for single-item selection. The problem is that after the user has selected the item, s/he needs to delete the selected item and start typing to search from the beginning. I think it would be more intuitive if the "deletion" step wasn't needed.

Steps to reproduce:

1. Click selectize input box
2. Type a few letters

Expected result: Delete the selected item and search the available items.

Actual result: Nothing happens, since step 2 is actually "delete selected item" and only step 3 is "type a few letters"