ummm, my name is Jason, not James.
My brother is named James, but i dont think he will be much help to you ;)
From the looks of it, it doesn't seem like it's even being considered.
PS - Yes, I know you can manually code the target attribute in, but you will lose all the manual changes once you update the menu through the WebAssist interface.
there are no immediate plans to include this in Menu Writer. if it is to be included, I would not expect to see it till Version 3.
a feature request was put through a while back, I will put through another one now.
you can also post your request to the wishlist forum.