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In my experience, single-click can be a pain when doing file-management. If I want to highlight a file or few (say, for deletion), my click opens them instead.

If I want to highlight a file or few (say, for deletion), my click opens them instead.

if you want to select more than one file you either draw a frame or use the Ctrl/Shift key. In both cases Konqueror doesn't open them.

The only case where you can accidently open a file is if you want to select only one. But if you want to delete it, there's no reason not to right-click the file. Or if you absolutely have to use the Del key to delete it you can press Ctrl while clicking on the file or draw a small frame around it.

Actually, I think that double click should be the default behavior

Double click is the default behaviour for users who select Windows-like defaults on first login for exactly the reason you mentioned.

Other settings still allow to change the click behaviour during first startup configuration.