I don’t see how it’s a bad idea. Providing automatic focus on a new pop up window seems like what always should happen.
Isn't it already autofocused after you click the "add" button? I mean it already follows exactly the same logic, the only difference being one extra step, which is the edit window itself. I can only agree that "add new" button should be autofocused. Sorry for misunderstanding if that's what you guys ment