Editor and Main UI in One Window

I'm generally a clean worker, and I love to work with in one window. So instead of pressing the "Filter Editor" button and have a completely separate window open up, I'd rather see the editor within the Main UI. Think of it like Apple's Logic Pro or Garageband. Initially, when Logic became Apple's new product, Logic's interface was separated and made into multiple windows. The Apple team then cleaned the UI up to fit it in 1 window. Garageband too is also in 1 window. In fact this "one window" interface is a new sort of clean UI thing that's being applied to a lot of things, like tabbed browsing. Photoshop turned to a tabbed editor too when they realized it saves space. So why not FilterForge?

Multiple editors? Might work....