When doing a Full Search, the Search Type is only one of two: Query Builder or Saved Searches. Making the selection box a drop-down list is unnecessary. It could be a toggle button (the default is Query Builder, so if you want Saved Searches, you would click the button. If you wanted to go back to Query Builder, you would click it again) or a radio button (default is Query, if you want Saved, you click the other radio button). The idea is that you save a click every time if you want Saved Searches. When you are working on many records, every click counts!