Refactoring Suggestion: Change Signature for Type Parameters

Brief description: Today, you can re-order method parameters with a nice dialog like so:

But there is no method for re-ordering type parameters. All

Additional Information: If I have code like this:

public class Foo<T1, T3, T4, T2> { }

and want to refactor it to:

public class Foo<T1, T2, T3, T4> { }

Today, I have to touch every single place they are used by hand. This basically makes the refactoring impossible.