Visual Studio or Resharper functionality for placement of using directives

UPDATE – ReSharper 2016.1: This option is now moved to Code Editing → C# → Code Style → Add ‘using’ directive to the deepest scope

Have you tried the ReSharper option:

Languages → C# → Formatting Style → Namespace Imports → Add using directive to the deepest scope

I’m not sure whether R#’s code cleanup will reorder the existing ones for you though.