in the FAQ there's explained how to remove Windows items from context menus ([url]Crash, exit or high CPU when right-clicking certain files]) and to add them if they they are hidden by default ([url]Tip: Organise and Speed-Up Context Menus]) respectively.
This works for all items in the file context menu (well, at least it seems so), but not all items in the folder context menu. There are some entries in HKEY_CLASSES_ROOT\Drive\shell that do not have a CLSID. Is there a way to remove (or add) them separately? I couldn't find out how to do it...