Point 1 (about the history).
Point 2 (about the menus).
Not, not in IE, maybe with a plugin.. but don't go there - no one would touch that. In FireFox you could do that with XUL, whats FF like 15-17% browser market share, if you're lucky. Opera, no not a chance..
Find a better idea for your UI, no one would know to look for a menu up there anyways.