As Microsoft blogger Raymond Chen writes, pressing Shift+F10 should show the extended context menu, like when pressing Shift+Menu Key as opposed to just Menu Key, because, with this fallback key combo, you can't avoid pressing Shift, which extends the menu.
However, running the standard command script @sendkey:shift+f10
shows the regular context menu. DOpus.SendKey("shift+f10")
(as well as new ActiveXObject("WScript.Shell").SendKeys("+{F10}")
) has the same problem and only show the regular context menu.
Physically pressing Shift+F10, however, behaves correctly and shows the extended context menu.