That's a nice idea. I do wonder if it could create some border problems, where there is a need to link to some non-neighbor states, but not through other states

That's a nice idea. I do wonder if it could create some border problems, where there is a need to link to some non-neighbor states, but not through other states that would otherwise be linked/shared neighbors. (I guess unless you wanted to render little overflights by airplanes or something)