I’ll look into adding this functionality. I am little hesitant because unless I can build a preference to turn off the preselection I’m sure some people would not apprecieate this.
Anyways, if you’d like to alter the file yourself, just find the following lines and make the necesary changes:
// -- Find This
$select = ($item == $field_data) ? true : false;
// -- Change to This
$select = ($item == $field_data || ($field_data == '' && $key==0)) ? true : false;
// -- Find This
$select = ($entry["entry_id"] == $field_data) ? true : false;
// -- Change to This
$select = ($entry["entry_id"] == $field_data || ($field_data == '' && $key==0)) ? true : false;
That’s off the top of my head though, so let me know if this works.