1) First part "Focus item (NC-mode)" is wrong, the item is SELECTED in NC-mode, when using 1-click options.
2) If NC-mode is disabled, the item is FOCUSED only, not selected.
3) If NC-mode is enabled, and single-click options are disabled, selecting item on extention doesn't work.
Something has changed in the last version (not sure if 740 or earlier), selecting was working even without single-click options, it's quite confusing.

FC 740 64-bit, Windows 10 64-bit.