Maybe I'm just new, but I just realized you can Ctrl-select or Ctrl-dblclick individual, separate pieces of text and copy them to the clipboard in one operation.
You are only browsing one thread in the discussion! All comments are available on the post page.
Are you talking about selecting multiple unconnected sections of text, so that they are highlighted at the same time? I think that's a Firefox feature.
Or are you talking about selecting something and then something else, so that only the last thing is highlighted, and finding both selections listed as separate items in KDE's clipboard manager?