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Double click a file to open it in the default application #29
You can easily configure that as a cleanup action, even with a keyboard shortcut (if you are willing to edit the config file - see other cleanup actions for examples how to specify keyboard shortcuts).
But not only is QDirStat not a general-purpose file manager (where people really do expect such behaviour), it would also be inconsistent behaviour between the tree view and the treemap: The treemap zooms in with a double click; doing something completely different in the tree view would be confusing. One can argue that double-clicking a directory in the tree view (which opens the corresponding branch) is something similar to zooming in (more exactly, refining the view to show something more detailed).