Sort/Filter Available Entities

I'm currently using this module on my site and it's fantastic! However, I have a large amount of entities (and growing). It would be nice if there was a text field above the listed entities that could be used for filtering the entities. For example, if my entities were States, I could type "Sou" and it would filter to just South Carolina and South Dakota. This would be a lot more convenient than scrolling through all of the available entities.