Overriding a textfield is pretty basic

	
static $searchable_fields = array(
		"Title" => array(
			 "field" => "TextField",
			 "filter" => "PartialMatchFilter",
			 "title" => 'Caller Name'
		)

In Order to override the design of a Dropdown field, I placed

		"Destinations.ID" => array(
			 "filter" => "ExactMatchFilter",
			 "title" => 'Destination'
		)

By removing the field in the array.
Is there a sort that I can place in the array?

I don't know (and don't think so) - but would very much like this option too!

you might be able to hack it by overriding (in your ModelAdmin_CollectionController)

	function getSearchQuery($searchCriteria){
	$query = parent::getSearchQuery($searchCriteria);
	//modify $query here
	return $query;
}

alternative is to have the best sort defined in the dataobject...

	static $default_sort = 'Title ASC';

Your alternative worked. Thank you!