It is very convenient to open folders with one click. But it is not convenient to open files with one click. Select multiple files clicking on first one and shift+click on last one is a best way to select files, but it is not working like that because of "one click mode".

So, I would like to ask developers to give user a choice in Dolphin settings how to open folders and how to open files. Personally I would set "open folders with single click", and "open files with double click".