Comment 5 for bug 826378

I don't have a personal preference on whether the grub menu should be hidden or not (in a way it's good to familiarize windows users with what it will look like when they switch to a normal dual boot; on the other hand, it can irritate users having two boot menus and that drives them to mess about and break things).

That was just my interpretation of the one-line entry in the blueprint - so that was why I filed the bug. So... I guess it should do whatever you intended it to do :)