This is will bring VB.net into line with C#, that can specify imports that are in scope within the body of a namespace.
C#

using GlobalLibrary

namespace Foo
{
  using FooLibray;

  namespace Bar
  {
    using BarLibrary;
  }
}

Proposed VB

Imports GlobalLibrary

Namespace Foo
  Imports FooLibrary

  Namespace Bar
    Imports BarLibrary

  End Namespace
End Namespace