Actually, left clicking opens for me it doesn't select. Are you using the double click to open setting?
In my single click to open scenario, I either select by clicking on the plus that appears on the icon on hover, or by clicking and dragging to create a select box (which also requires covering the name, not just empty space).
In configure dolphin->view->details there is a radio button choice between opening files by clicking anywhere on the row or clicking on icon or name. I tried changing it to anywhere but this did not appear to work, I still need to couch in the name.