I'd love to have both the drawing and design files be contained in one file. Would make moving files around easier, cut down on clutter.
There isn't really an interface inside of Fusion right now for that. You'd almost need a new or updated drawing workspace. So open up your design file, and use the workspace drop down and selecting Drawing would bring you to your drawings and sheets you currently have. You could then create new ones from there as well.
If you were in a hurry to get to your drawings or something like that, then in the data panel, maybe add the ability to right click a design and select drawings to jump straight to the drawings you've created.
This would at least make my life easier. Not sure about others, but figured I'd toss that idea out there.