Re mentioned 'bug': If the Option is set for Top of Menu and you insert it via context menu of the *Bookmark Folder*, it inserts it at the very top. If you insert via context menu of an individual menu item, it inserts just below that menu item. Reversing that to above if Option is set to Bottom of Menu seems unexpected/confusing, but I suppose a separate Option could possibly be added if that would be helpful.

Unfortunately with the current Firefox addons API, it is not possible to prevent the menu from closing. Some properties cannot be changed via the API, however, you can change the title: Ctrl-click the 'Bookmark Tab(s) Here' entry or change the add-on's Option to Always Show the Editor Window.