I was trying to make a bridge between LibAddonMenu-1.0 and 2.0. Something like Sasky's
LibAddonMenu 1.0 to 2.0 Interface, but not just for developers. It works, but only for addons which doesn't add custom controls to the menu. As I don't know how to make it work for all addons, this will probably never be an official addon.
If anyone is interested, file is attached.